 If you liked
Danganronpa: Kibou no Gakuen to Zetsubou no Koukousei
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 ...then you might like
Ansatsu Kyoushitsu
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These two manga have some similarities
-The two main mascots(alien Octopus in Ansatsu,mono Bear in Danganronpa) have similar traits,and habit
-The two mascots have some objective that is to destroy something.
-In Ansatsu Kyoushitsu the mascot is teaching the students to be better,but in Danganronpa the mascot teach them what is despair.
if you like more serious,dark manga then danganronpa for you,but if you like comedy then Ansatsu for you.