 If you liked
Alive: Saishuu Shinkateki Shounen
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 ...then you might like
Majin Tantei Nougami Neuro
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hello, apocalypse. the concept of human evolution plays a significant role in both manga, sprinkled with hints of supernatural beings at work. however, neuro tends to view the conflict from the mystery angle whereas alive does so from the adventure angle (ridiculously long bicycle rides will do that for you). they all have good action.