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Yuko Kawaguchi is waiting for her ex-husband to be released on parole. Although she divorced him and had her marriage removed when he was incarcerated, her heart is still in Hasegawa, her husband's gender. However, five years of being single is a heavy burden for a woman who is naturally sexual, and once a month she requests an erotic massage as an outlet. Although she swears that she will never let him have sex with her, when she gets excited she ends up accepting what the man wants. On the day that her ex-husband Koichi returns home, Yuko's younger brother Masao is also on his way to her house.