 If you liked
Fukushuu Kyoushitsu
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 ...then you might like
Happiness
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From both series, there is the theme of bullying as the main protagonist is ostracized by their peers. However, their life begins to take a darker turn after certain events. This includes taking a path that changes their life forever as they take certain measures. Both series is known for their violence as well as mature context. Happiness also has supernatural elements that changes the main protagonist drastically.