10 months since my husband passed away. Aika, who lived with her husband's father, Kazuyuki, was thinking of returning to her parents' home after the first anniversary. I hesitated to leave my father-in-law alone, but my mother needed nursing care. Kazuyuki stares at Aika like that... Regret for his son who died without a child, loneliness for loneliness, and it inclines the father-in-law to a distorted love. When Aika's body is tied up with a rope and her freedom is taken away, she drags her into the obscene and obscene world of SM along with her feelings for Aika.