 If you liked
Higurashi no Naku Koro ni Kai
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 ...then you might like
Mawaru Penguindrum
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Both are about a group of children and teens unveiling a terrorist conspiracy, main characters being shunned for their parent's fault (Takakura children in Penguindrum and Houjou children in Higurashi) and discussions whether a cruel and apparently unscapable fate can or cannot be changed.