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It happened in an instant. Rikka's world was turned upside down when her school field trip bus flipped and crashed into a lake. Everyone inside that bus drowned... except for Rikka. Her survival wasn't due to mere luck. After being discharged from the hospital, Rikka faced repeated attacks in a series of strange incidents, all involving water... and a sadistic aquatic beauty who shares her name — Rikka!
What does this sinister Rikka want from our heroine? What saved her from drowning, and who provided it and why...?
(Source: Shoujo Magic)
A live-action movie adaptation was produced in Japan in 2006.
