 If you liked
Hyouryuu Kyoushitsu
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 ...then you might like
Igai: The Play Dead/Alive
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Both are apocalyptic stories. While Igai is about zombies and Drifting Classroom is about being trapped in a wasteland, there are some aspects of both stories that are quite similar.
Both stories are set on a school campus.
There is political turmoil among the survivors as they try to navigate this new situation they find themselves in.
There is a ton of graphic violence and death.