 If you liked
Hyouryuu Kyoushitsu
|
 ...then you might like
Yakusoku no Neverland
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Both series follow a group of children who finds themselves in an unknown, alien-like world and must adapt to survive its dangers.
This is not the main premise of Neverland as it is for Hyouryuu Kyoushitsu/Drifting Classroom but rather it describes one part of it after a certain point. Moreover, in Neverland the group is tight-knit, while in Drifting Classroom they are not and that is another aspect that impedes their survival.