Crimson Climax

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Crimson Climax (Japanese: 螢子 - "Hotaruko" / Firefly")^[1] is a hentai genre animation movie released in 2003. It contains thriller, horror and erotica elements.^[2][3]

It was first released as a three-part series of films, and later merged and released as an OVA.

After her mother's sudden death, Ryo returns to her island-based family home.^[4] There, she begins to look into her mother's strange past behavior.^[5] Upon meeting her cousin Hotaruko, Ryo is lured into a cult.

• Hotaruko at IMDb