 If you liked
100-man no Inochi no Ue ni Ore wa Tatteiru
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 ...then you might like
Deatte 5-byou de Battle
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Being thrown into a game-like system to fight for your survival.
By clearing a mission a new and a tougher scenario starts.
Both series have similar thoughtful main character who comes up with interesting solutions and in my opinion is the reason why both series are a nice read.