 If you liked
Major S2
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 ...then you might like
Hunter x Hunter (2011)
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"Kaidou Arc" in Major reminded me a lot of "Pro-Hunter Exam Arc" in HxH. Two main characters have to team up with other applicants and to pass the qualifying examination they have to trust other members even if they are complete strangers. Both shows have other similarities, but I won't spoil it. Things often get nail bitingly intense each episode, prepare yourselves for unexpected turn of events. If you enjoyed one of them, you can get the same feeling from the other one.