Gantz
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Gantz

Alternative Titles

Synonyms: Gantz/Osaka
Japanese: GANTZ
English: Gantz
More titles

Information

Type: Manga
Volumes: 37
Chapters: 383
Status: Finished
Published: Jul 13, 2000 to Jun 20, 2013
Genres: Action Action, Drama Drama, Horror Horror, Sci-Fi Sci-Fi, Supernatural Supernatural
Themes: Gore Gore, Psychological Psychological, Survival Survival
Demographic: Seinen Seinen
Serialization: Young Jump
Authors: Oku, Hiroya (Story & Art)

Statistics

Score: 8.101 (scored by 113549113,549 users)
1 indicates a weighted score.
Ranked: #5952
2 based on the top manga page. Please note that 'R18+' titles are excluded.
Popularity: #30
Members: 234,288
Favorites: 18,369

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Resources

Recommendations

I like to think of Psyren as the shonen-version of Gantz. both series involve a "game" with real lives at stake, set up by some mysterious person, while the main characters try to beat the game to win back their freedom or for other goals later realizing there´s more at stake 
reportRecommended by Toost_Inc
Both follow the same concept of people being forced into a death game. Both are very graphic and gory with interesting story and characters, GANTZ is a little more supernatural with more nudity as well but above all both are very similar. 
reportRecommended by Vexys7
Both have violent but cool fighting scenes and even some sex together with interesting stories. Beserk follow a medieval fantasy world while Gantz is set in alternate present cyberpunk. Both main characters are also affected by unknown forces. 
reportRecommended by acceleratum
Reads like Gantz 2.0 so much that it's surprising it isn't authored by Oku Hiroya. Features a selfish MC that develops. Starrs wacky monsters for brutal fights, features explicit content routinely and has a mascot for comedy relief between fights. It's like someone fused Gantz with Parasyte: The Maxim. 
reportRecommended by ValtElf
Both deal with a team of people sent out to fight against an alien threat that is constantly becoming stronger. They both also constantly drive home the fact that "no one is safe." Lots of balls to the wall awesome moments as well. 
reportRecommended by Vexys7
It's kind of obvious since both are made from same mangaka, but they are revolving around the same themes as well, saving the world, becoming powerful unexpectedly, action and bang bang ドンドン! this time it's Suzuki from gantz who've forgotten everything that happened, gotten older and weaker. Well not literally, but if you've read gantz you kind of get the idea. Bang bang! ドンドン!great stuff.  
reportRecommended by txrxgxu
What connects Gantz and Shingeki is their equally brutal, unflinching violence. Gantz offers 'guilty pleasure' elements (namely, huge boobies) not present in Shingeki, but in both titles characters are introduced and then, without warning, murdered in graphic detail. The intensity level of two is high enough to keep one on the edge of their seat throughout. If the games from Gantz excited you, then the giants raiding the last home of humanity - and ripping humans apart like toys - would also excite you. The quality characterization in the two makes it impossible not to care. 
reportRecommended by AironicallyHuman
In these two, death is only the beginning. Initially average lead characters find themselves confronted with monsters and fight death-matches over and over AND OVER until they become killing machines without fear or doubt. Not even death itself is an escape since characters are revived in Gantz and death results in a never-ending time loop in All You Need Is KIIIIIIIILLLLLLL. There is no other similar characterisation that I have encountered. There are plenty of survival series out there, for sure, but none where characters grow mentally stronger by dying and gradually abandoning fear. Death being the starting point of both series, rather than an  read more 
reportRecommended by AironicallyHuman
They are both about people being forced into a death game. The both pretty much start off the same way, although the characters are different.  
reportRecommended by Fermorals
Being dragged into a 'game' in reality, you have to kill to survive! 
reportRecommended by Connybaum
Let's see... -- An endless series of 'play or die' games, where survivors from each game must continue to work together. -- The enemies in both are aliens... until the aliens start being dicks and make humans fight it out. There's no text-sharing black sphere in Kamisama but the aliens themselves tend to be quite chatty, with the same sort of twisted humour. -- Almost anyone can die. Getting attached to characters is a bad idea (until Kurono appears in Kamisama with his 100-points, anyhow). -- No attempt is made to explain why, exactly, people are finding themselves forced to go at it with weird as hell enemies (Gantz  read more 
reportRecommended by AironicallyHuman
The too are very similar killing monsters because you have to, blood, gore, death, ect. The only main difference is in Zetman the main character is a "Player" or monster that is designed to kill the other monsters. In Gantz it is regular humans that have died and are now sent to kill random alien/monsters. The art work on both are amazing and the thought that goes into both are amazing. 
reportRecommended by cappy
Both Mangas are very dark, mature, bloody, violent, horrific, and all things that make a good seinen. They both have the premise of fighting to survive, aliens and Zombies with the latter. They also are similar in that later in their stories they things become extremely grandiose in scale and that affects humanity on an existential level. Though they both possess a similar tone, they differ greatly in approach with characterization . As Gantz is more of the cliche cool/bad ass guy that kills everything with his friends, while I am a Hero follows a guy the opposite, being delusional, socially awkward and a bit  read more 
reportRecommended by reluctantbeeswax
Survival games with lots and lots of deaths. 
reportRecommended by BlindNoldor
both gantz and deadman wonderland are sci fi stories in which the main character is wrapped up in something he doesnt want to have to deal with. Both mangas are also very bloody so if you enjoy the gore either will fill your needs.  
reportRecommended by musashi7
Both have high tech crazy weapons, awesome backgrounds, and awesome stories ,an d awesome 
reportRecommended by Bendero
In both manga: - the protagonist is part of a group of people tasked with slaying bizarre supernatural foes in a modern urban environment; - the battles get quite violent and brutal; - there is an underlying agenda about their fights; - protagonist's character experience growth along the way; - features drama that brings a tear to my eye. 
reportRecommended by Genoard
In a way it's similar to gantz, since people are basically forced to be a part of a 'game', the purpose of which they aren't told.  
reportRecommended by justafan
The emotional and physical hurt are thicc as hell in both of these manga. Very violent and full of gore, though Fire Punch is a good bit less sexual. Both teenage boy protags deal with feelings of guilt and answer the consequences of their own selfishness in a world in which they feel forced to kill due to incredibly powerful, mysterious forces acting on a large scale. Both manga disrespect plot armor: loved characters *will* be lost. 
reportRecommended by tsubashi
Scifi stories with horror elements. Both are thought-provokingly psychological and highly suspenseful with great drama and interesting storylines, and they both also contain deadly enemies and extreme violence. 
reportRecommended by Bocknoi
Both share semi-realism art style, gore and dark athmosphere. 
reportRecommended by twy
both contain extreme violence and people just trying to survive in the situations they find themselves 
reportRecommended by sesgel
Both series are about a group of people that are forced into a kill-or-be-killed "game" on a regular basis with little warning, in which the monstrous opponents are not the only threat. Gantz has a lot of blood, gore, and sexual content, while :REverSAL is light on the blood, has little gore, and no sexual content. 
reportRecommended by lithiumflower
If you like GANTZ you will love Highschool of the Dead (HOTD) as well. Both have a kick ass main character and tons of hot girls that somehow tie into the story plot. In GANTZ you follow a team of individuals as they are summoned on missions to kill off aliens, while given extremely powerful weapons. In HOTD you read as a group of high school students are forced to fend off zombies and fight for their lives, trying not to get bitten. As in GANTZ, HOTD is filled with blood and violence as the band of average individuals try desperately under circumstances they have  read more 
reportRecommended by Xavan
I dont know what people think of Hellsing and Gantz but to put them both in a nut shell. gore, more gore, and destruction. Hellsing is a Alucard killing off his own kind (vampire) and Gantz is a group of people killing aliens. Both have very detailed story lines. Gantz would be a little more gory because there is more fighting involve but Hellsing is a great way to laugh (depends on how you like gore).  
reportRecommended by cappy
The games in both manga follow very similar rules: * Characters are transported to an alternate world/space at some intervals * They are given Quests which they have to complete in order to return * Life on the line, if everyone dies the "game" is failed There might be even more similarities ("game masters" are strange looking men who give out quests using their strange 'lingo') So if you like manga with such game elements it might be interesting for you. Gantz is mature audience oriented compared to 100-man, however both stories get rather complex and interesting as story goes on! 
reportRecommended by Lylaaz
When reading Uzumaki, it made me think of GANTZ regardless of being different plot-wise. The morbid and twisted scenes, along with the weird and strange creatures that definitely have a likeness to the Aliens featured in GANTZ.  
reportRecommended by Gonee
In a bizzare scenario, Earth is put into a danger by some outer forces. A regular folk protagonist gets acces too a weird technology that lets them fight of the danger. Both have interesting enemy design, photo-like illustrations, contain both action and nudity and are in fact made by the same author. 
reportRecommended by abystoma2
Mahou Shoujo Site is basically a magical girl remake of Gantz (which is basically a seinen action remake of the mahou shoujo genre ;) ). People get chosen by a supernatural force, they kill each other and stuff happens. What makes Mahou Shoujo Site stand out is the great characters and a solid story (and lots of violence!). In my opinion it has more in common with Gantz than Madoka Magica. 
reportRecommended by txrxgxu
It has the same premise where people get sent into a 'room' of sorts and have to defeat certain entities. 
reportRecommended by Sushigawa
Gantz and Kaiju #8 share some similarities with their general premise: -Monster tech in the form of power suits and weapons = Alien tech in the form of power suits and weapons. -Overwhelmingly powerful monsters that are large-scale threats = Overwhelmingly powerful aliens that are large-scale threats. -MC has a childhood friend who he wants to be like and stand alongside = MC has a childhood friend who he eventually wants to be like and stand alongside. -MC can't risk revealing his secret power = MC can't risk revealing his secret alien hunting sprees. 
reportRecommended by Captainjeddy
Similar dark and gory vibe to Tokyo Ghoul, Gantz removes the ghouls, adds aliens, more guns, and maybe a few less dead people. Definitely a good read if you're looking for a lighter, but still dark manga. 
reportRecommended by TheAlch3mist
Both MC's get thrown into a death game. Minimum has not been serialized for as long and is just starting to get more into the fighting rather than the nudity which it capitalized on in the earlier chapters. If you enjoyed Gantz you will probably enjoy Minimum since the targeted demographics are exactly the same.  
reportRecommended by Kaguro
There's a character that says "doesn't that looks like Gantz?", that pretty much explains everything about this one-shot. 
reportRecommended by BlindNoldor
Human fighting some mysterious monsters? that's what this manga have in common. there are even human fighting in some suits in hakaijuu, well you have to read it i won't spoil that much. but if you've liked gantz you will like this title and the around! 
reportRecommended by shinomonogatari
Both main character die and come back alive In Gantz they are revive as Gantz Hunter and they must fight with alien to gain point so they could leave the game. In Re:birth- The Lunatic Taker they are revive as takers, to live on they must either kill other takers and get their point or they must go and hunt tenshi. Both manga give off the same feel and action~ Gantz is more of sci fic and contain more chapter the Re:Birth 
reportRecommended by tianshenzai
Both manga have teams of involuntary people formed to fight to save the world. 
reportRecommended by Nazgand
Both Aphorism and Gantz have the main idea of surviving against strange beasts/aliens. Both are really bloody and grotesque.  
reportRecommended by InfiniteRhapsody
Both involve people in their teens being tossed into a life-or-death situation where the normal rules of society no longer apply. 
reportRecommended by Torisunanohokori
Enigma is similar to that to GANTZ in that a group of characters are dictated to perform missions which are set by mysterious figures (which the titles of the two series are named after). Such missions are governed by a set of rules and oftentimes require characters to work as a team in order to succeed. 
reportRecommended by radiantfire
If you enjoy the mystery and bloodshed that GANTZ has brought to the table, you'll enjoy La Mosca(The Fly) with a passion. Even now the GANTZ manga still provides mysteries to solve after several years of chapters and volumes but every good as the last, La Mosca has such potential to come out like GANTZ, both providing monsters to kill, prizes to earn, and hot deadly girls. 
reportRecommended by NoSurrender
While Gantz have a darker tone, Dandadan is more light hearted. Both have ailens/monsters and both have the characters fight in closed off realitys.  
reportRecommended by Blue-kun
Despite being different genres and being under different circumstances, The stories are somewhat similar in that the main character is periodically sucked into a situation that is a considered a life or death game. In shiniki you get money, in gantz you get points. One is sci fi while the other is fantasy, if you like one, you might like the other.  
reportRecommended by Thedudeist
Grotesque and bizarre creatures, with a lot of violence, action and ecchi 
reportRecommended by Metalerogreymon
Gantz is a death game where people are forced to to kill. So the premise is similar, although the setting is completely different. One is fantasy, while the other is sci fi. being a game, SOA doesnt have any actual gore, while Gantz is more mature with both gore, and mature content. If you like one, you might enjoy the other if you want to feed on some misery in different forms. 
reportRecommended by Thedudeist
Both series focus on MCs who were dragged into game-like systems that confront them with various monsters. As they grow mentally and physically stronger their quests becomes tougher. Epic fights are included. Gantz is more gory, ruthless and complex. 
reportRecommended by anime_hunter420
Both stories are very similar because both plots involves a game that the main character play.  
reportRecommended by haatsunemiku
Both series are bloody violent and those looking for gore shouldn't look any further than these two. 
reportRecommended by radiantfire
Freesia is grittier than gantz, but they have the similar existentialistic theme where you can read it both for the plot and the action. I love both and if you can stand the sketch like art and darker psykological theme you'll surely love freesia.  
reportRecommended by txrxgxu
In terms of violence and gore, Kurozuka seems to less exaggerated than Gantz. Although you are guaranteed to see guts flying in both cases. In terms of the narration, both story present a very unique and experimental style. Gantz having to constantly changing the characters while Kurozuka constantly time jumps (2 first volumes already cover a few thousand years). Both have this mysterious supernatural plotline well hidden along the action. 
reportRecommended by wakka9ca
Azumi feels like an inspiration for Gantz, both the excessive violence and the main character's vulnerability. Apparently Azumi is a famous classic so that wouldnt be very strange. If you like psychological action, Azumi is a great read, even if the art feels a little dated. 
reportRecommended by txrxgxu
Without spoiling too much, both are very violent and very tragic. The plot isnt very similar, but the tension in the plot is. If you like Gantz you'll probably like Gangsta, they even share the same first letter in the title, must mean something. 
reportRecommended by txrxgxu
Although at first Gantz starts off at a small scale, the later chapters become similar to the setting in ayanashi in the idea of humanity being cornered. Its a long read, if you dont enjoy gantz itself, then it wont be worth reading all the way up to the point that led me to make this recommendation. Otherwise, please enjoy.  
reportRecommended by Thedudeist
In the genre "unwillingly receiving super powers and killing stuff" Gantz is regarded as one of the corner stones, for good reasons. Even if Biorg Trinity starts out pretty confusing it really grows within a few chapters, and I'd say it's a great read for anyone who's into this kind of story. Just like Gatz the premises deepens and gets more intricate, together with some of the best art in the history of manga. 
reportRecommended by txrxgxu
If throwing Gantz and Hunter x Hunter into a blender results in Psyren, then throwing any of the Yugioh series into a blender with Gantz results in Chaosic Rune. Seriously, the only differences between the 2 series is that Gantz is much more graphic, and Chaosic Rune uses cards to fight instead of guns. However, both series have a lot of fanservice, and both are very violent. 
reportRecommended by RoarkTenjouin
If you enjoyed Gantz you will "like" Kiriko and the sequel as they have similar vibes at times with the existentialism, human nature, cruelty, dealing with the unknown, escaping, death, with constant suspense and adrenaline. 
reportRecommended by koley
Crazy mega violence with lots of crazy shit as well 
reportRecommended by KuroGFX
Both series exclusively centers around the protagonist and their life, there will indeed be a lot of side characters that will occur by itself, their presence will impact the protagonist but they are not all so important to the progression of the story. Similar to Gantz, The climber will start off as a more light and fun series but the more you go through each chapter, it'll get heavier. 
reportRecommended by Zestiria
Pretty gory and dark seinen manga. They both have a great story which have big elements of mystery. There are also some nudity and stuff like that. Overall both great and interesting stories and if you are a fan of either one then you should definitely check out either one. 
reportRecommended by stone_tree
Gantz and Houseki share the same feeling about character dump in a complexe world who evolve by risking their life. I love the way that in both story main character evolve and become more and more pragmatic.  
reportRecommended by Rebfy
Both have lots of popular culture references. (every Ender Geister chapter lists the references it has) Both have supernatural and sci fi elements and lots of action. Both have considerable amounts of fanservice. Both are very over the top and hilarious at times. 
reportRecommended by TheNextDoor
Honestly this manga reminded me of a that Gantz feel though it wasn't excecuted/written as well as Gantz, if you want to see something generally better I'd suggest checking out Gantz. I think you can see the character visual design/art as something vaguely similar to Gantz as well. 
reportRecommended by Dpsdps55
Similar plots Gantz is more supernatural and the enemies are aliens but beyond that it's like a mirror to Doubt. 
reportRecommended by Vexys7
- seinen, survival game, god's game, thriller and blood everywhere - MC with selfish personality - kill something that don't want to - have point/score system - anyone can be killed anytime - similar dress design - playing some school song before game starting 
reportRecommended by RyuiZaya
These two manga have characters using bio suits fighting other powerful evil monsters. They both deal with themes of the darker sides of human nature. Not to mention, these two manga are filled with action, blood, gore and violence. Definitely recommended these two manga for anyone who enjoys dark violent manga. 
reportRecommended by Genocyberfanboy
they both share the concept of meet a certain objective to have a wish fufilled (Gantz score 100 or more points and Dragon Ball collect 7 dragon balls) and typically wishing a friend or comrade back to life is the common wish in both series and usually these things are tedious to obtain so much battles and adventures they go through great lengths just to obtain each thing. similar game..similar request.. 
reportRecommended by Josiah-Joestar
why akira? cause makes a lot of references, of people getting awesome powers, gravity.... The end of the world... so many references. But the real reeference is in akira. In gantz doesnt Develops so much 
reportRecommended by Whiskys12
Both of them are dark, violent, action-packed, and contain sexual imagery. They both fit within the seinen demographic and are definitely similar, even as one is a political thriller (Sanctuary) and another is a science-fiction manga (Gantz).  
reportRecommended by donut_jelly
Modern day sci-fi, decapitation/sliced body parts and moody teens fighting off terrifying aliens invading the earth.  
reportRecommended by denpanosekai
Artsyle wise, both of these are some of the most realistic feeling manga I have ever read. Both are dark seinens with a sci-fi/supernatural edge. Both main characters are even named Kei, and aren't all that likable at first ;p Gantz is the more vulgar between the two, but both have a similar feel that I am sure Ajin fans would like.  
reportRecommended by Capnskart
Both are mangas that deal with games that play with life and death. Both have characters who are killed then revived to fight in a "game" of life. Battles with monsters determine whether you will be able to live the next day or not. Though, GANTZ deals with a lot of sci-fi idealogies, including technology and 'aliens'. 
reportRecommended by Jasonbear
Both involve the characters participating in rounds after rounds of combat against mysterious enemies that get bigger and stronger as the series proceed. In addition, readers can feel the impact in the deaths of the characters of both the series. 
reportRecommended by BlitzAceSamy
Both titles revolve around a game best described as death match, although one is set in our reality while the other has more of a Sci-Fi-like setting.  
reportRecommended by Turin2609
On the surface, these two seem as far off as two series can be but from the get go you'll notice how the big event that changes the protagonist's lives are similar in that they are absolutely vague, have little foreshadowing and seems to have rules that are randomly inserted. Gantz is the more graphic series but as hard as it is to envision due to the artwork and the genre, After School Nightmare is actually the more violent series and a whole lot more important characters die in it. In the end, it is best to treat this recommendation not as a "what do you  read more 
reportRecommended by Foolness
Both Manga have Violence and Nudity, although the setting is very different (Ninjas X Aliens) both have the same dark atmosphere surrounding them, from the unwillingness of the main character to fight, the relationship of the characters they are both pretty similiar 
reportRecommended by 7911
Blood, violence, sex, and boobs. GANTZ is the more pessimistic of the two by a long shot, but if you're in it for the fighting and fanservice, well there you go. 
reportRecommended by lithiumflower
A group of people are given a second chance at life but end up having to fight monsters to survive 
reportRecommended by AfterGlow
When reading Neverland I thought it had also similarities with Gantz: - Fighting against demons/aliens - A lot of deaths - Humans as a livestock - Strong willed main characters So if you are into these kinds of stories you could try both out 
reportRecommended by Lylaaz
Another gory and creepy as shit series. Both are about the same level of quality. Mahou Shoujo though feels more like Dawn of the Dead though to be honest. But they both kill off anyone they want to really. You don't really feel safe about anyone.  
reportRecommended by DarkD1
This is a very promising manga - I read the first 30 chapters and I totally loved it, but I took a break because I wanted it to publish more chapters before I start reading it from the beginning again. This manga is also a MUST -it is really really good. 
reportRecommended by iETHAN
If you like dark manga with macabre, puppet master-esque storylines, like 8.1, then Gantz would be right up your alley. 
reportRecommended by anumericalevil
Group of people get special powers in order to fight aliens/demons. All characters have their own more or less tragic backstories. Both titles have lots of blood, gore and deaths. Gantz is little more mature  
reportRecommended by Gokudo-kun
They are both made by the same mangaka. They both put in a sci-fi, ecchi and action environment. If you liked Zero one you will love Gantz which is far more complexe and contain more chapters. 
reportRecommended by Petitchat
Kid that nobody really believes in steps up. In Gantz a bunch of people have o fight aliens in almost like an alternate universe and kei is the leader.The story has a lot of gore, there's rape, it's mature but very good. In Jisatsutou Sei is a nobody who attempted suicide, sent to an island with other attempted suicidal people, and uses his kick ass archery skills to survive. It's very good as well. 
reportRecommended by Ardnaed
In both GANTZ and Trace, there are people who are chosen to protect society even though the truth about them always seems to be hidden. Also, in both manga, there are different groups who are fighting amongst each other until an enemy comes that is powerful enough to make them realize their mistakes and unite to defeat a common enemy. Although the people in GANTZ don't have powers like those in trace, they are equipped with futuristic weapons and suits that give them the ability to combat the enemy. 
reportRecommended by santaclause
After the moment they die, a group of people is resurrected and given a mission to protect the people against supernatural beings, aliens in Gantz, zombies in Z-Loan. For killing this monsters they will win a reward, points in Gantz, money in Z-Loan, and if they reach an amount of points or money they will be able to come back to live again. 
reportRecommended by BlindNoldor
They exploit the darkest side of a rotten humanity. Rape, murder, drugs, and stuff is seen as normal thing in the human race. Never care about others, only about yourself. 
reportRecommended by BlindNoldor
Both are about people trapped in another world, set up by some mysterious person, with situations that put their lives at risk, enemies and deaths. Tenkuu Shinpan has more shonen style and paranormal powers and gantz has futuristic weapons If you liked one of them you'll probably enjoy the other. Enjoy the reading 
reportRecommended by Neok200
both manga are dark,mature,involving Monster-like ability and Blood Everywhere 
reportRecommended by yakoo
Both are edgy ultraviolent action manga with some existential horror and a lot of horny. 
reportRecommended by sumo671
Both manga's involve a weak main character being put in a penitentiary were he meets a group of companions that will help him stay alive and sane. Both Protagonists eventually find out that the human race is being attacked by another species and of course they take up arms to stay alive seeing no end insight. The main characters start to adapt and become better and better at staying alive almost like they where born for a disaster like this to happen. Both Manga's share Action, Mystery, Horror, Sci-Fi, and Psychological genre components. 
reportRecommended by Obeythealfa
Gantz is humans vs aliens where as Narutaru is humans vs humans using aliens.  
reportRecommended by Kaguro
Both are that "just turn your brain off" type of manga, packed with action scenes and also very graphic. 
reportRecommended by abluble
The people are forced to be a part of a 'game', the purpose of which they aren't told. Both protagonists seek to find the "bad guy" and aim to end the senseless game in which they were plunged into unknowingly. 
reportRecommended by PirateKingz
Despite different genres, both stories have similar main characters that start out ordinary but have to survive and overcome intense challenges by their own quick thinking and self-improvement. It definitely gives the reader that rush. Also, there are cool teams in both series. 
reportRecommended by bmw830
Protagonists thrown into a semi-supernatural fight for survival (with a low chance of actually making it out alive) while trying to maintain an ordinary life. Violence, desperation, intermittent insanity, and things you can never unsee ensue. 
reportRecommended by lithiumflower
Both deal with humans fighting against aliens. They are dark, and have a heavy atmosphere and a unusual storytelling, with many scenes without words. Both are similar in the characters design. 
reportRecommended by BlindNoldor
The basic plots are so similar it's not even funny. Both manga even have a Gonzo anime adaptation. Group of high schoolers dies ---> They come back to life ---> They are forced to fight against monsters/aliens for initially unknown reasons ---> They'll die (again) if they either refuse to fight or die during the battle ---> They discover to be copies of their original bodies ---> They are called with a song (which in Red Garden comes with a storm of butterflies) at the beginning of every mission, etc. Both are dark, psychological, horror manga full of violence, gore, and action, but Red Garden is much  read more 
reportRecommended by RenaPsychoKiller
Although Hai to Gensou no Grimgal is fantasy and Gantz is sci-fi, both have a similar atmosphere and character setup. Both begin with a group of people who is transported to some place and have to kill monsters and aliens in order to survive. Both protagonist are a normal and afraid kid who just go with the flow, always relying on more charismatic characters, but eventually they will have to become the one to protect others instead of being protected. Both have very graphic and excellent artworks. 
reportRecommended by BlindNoldor
Both involve people who are unwittingly drawn into a "game" where they must fight for their lives 
reportRecommended by Zeth44
An assortment of dynamic characters are thrown into a world of violence and massive collateral damage in these two epic series. GANTZ features crisp, elaborate artwork, but if one does not want to see flying guts in high definition, read Project ARMS instead. 
reportRecommended by Qualtagh