Mid-Night Anime
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Due to her mother's death, Ryo was called by her relative Mizunu and came to a small island floating in the Sea of Japan. Mizunu is the head of an ancient family that resides on the island and rarely appears in front of others. Keiko, Mizunu's sister, is the only person who can truly understand his emotions. For Ryo, Keiko is a cute cousin who adores her like a real sister, but at times Ryo feels confused and frightened by Keiko's displays of violent behavior.