Gibo no Tsukaeru Karada.

Michiko Ebina is a 44-year-old full-time housewife. During summer vacation, Michiko and her husband warmly welcome their newly married daughter and son-in-law. After dinner together, Michiko suddenly feels like she is losing consciousness. The rest of her family is fast asleep and cannot be woken. Everyone except her son-in-law, Haruto, that is. Haruto brings Michiko, now unable to move, up to the bedroom on the second floor. Everything is going perfectly according to Haruto's plan.