Is Hotaruko hentai?
English title: Crimson Climax
Yes
Rated Rx (Hentai) on MyAnimeList.

OVA · 2003 · 3 episodes · Rx - Hentai
Hentai
Lured to a cursed island by a carnal cult, victims are brought to the throes of ecstasy, then brutally sacrificed in a bloody occult ritual. When sexy Ryo visits her late mother's island home, she's in for a terrifying surprise. Can she escape with her life and her virtue intact. (Source: ANN)
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