 If you liked
Tsumetai Kousha no Toki wa Tomaru
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 ...then you might like
Kanata no Astra
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Both focus on a ya cast and their relationships as well as being caught up into some strange shit and figure out how they are even going to get out of there as well too.
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Recommended by Disapeared_Ghost
A School Frozen in Time and Astra: Lost in Space are two shounen manga about a group of kids stuck together in a situation beyond their control. The survival doesn't feel immediately as dire in the former as it does in the latter, but the group must stick together and try to make it out of their situation safely... all while suspecting the culprit behind this situation is amongst them. Many characters have sad backstories that are revealed as the story goes along and there's even some surprising plot twists thrown in.