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A mother who has lived only for the outlet of her father-in-law. The eldest daughter, Rei, who admits that he inherited the nasty blood. After all she is also father-in-law. And I want to protect only my sister, Kana, from the hands of my father-in-law... At that time, Kana, who started living alone, was sneaking up on the madness of her neighbor. Beautiful sisters are loved by the darkness and fall...