 If you liked
20th Century Boys
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 ...then you might like
Bloody Monday
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A bunch of kids saving the world, do note that Bloody Monday is shōnen unlike 20th CB.
A catastrophe is on the way that might kill a great part of the population on earth. But luckily there is a small group of people that are aware of this plot and are trying to stop it before there's no turning back. This is the main theme that both of these anime share. If you like tis sort of battles with a lot of drama and mystery then this is perfect for you!