 If you liked
Helter Skelter: Hakudaku no Mura
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 ...then you might like
Saimin Ryoujoku Gakuen
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Both series have sad ending and in each of them you can find group of guys having lustful group sex with innocent females. What's important we won't find much BSDM or SM scenes in both titles, so if you liked Hakudaku no Mura give a Saimin Ryoujoku Gakuen go because either of them have similar way of showing sex scenes and their variety.