 If you liked
Corpse Party: Tortured Souls - Bougyakusareta Tamashii no Jukyou
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 ...then you might like
Higurashi no Naku Koro ni Kaku: Outbreak
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Both of these OVAs are regarded as the alternate bad ending route of their respective main stay series where the worst possible outcome has been achieved. Expect violence filled with thrills and a psychological perilous narrative. It's necessary to get context from the main stories to be able to appreciate the selective narrative of these bad routes.