Airi Hinata plays Yuka, a married woman who begins living with her husband's father, Tokuzo, who requires caregiving. Though she has no objections to caring for her late husband Tetsu's father, the kind and compassionate housewife soon finds herself taken advantage of by the lustful Tokuzo. Under the guise of caregiving, she becomes entangled in sexual acts, initially confused but gradually drawn into the pleasure. As the story unfolds, Yuka begins to develop unexpected emotions toward her father-in-law.