Hideaki, a son-in-law, has ended up living with his mother-in-law, Rina, who is careless and goes at her own pace. One day, Rina is fired from her part-time job after making a mistake, and is depressed. Hideaki sympathizes with Rina, who is looked down upon by her family, and decides to help her find a job. However, when Hideaki notices Rina's overly voluptuous breasts, he gradually finds himself unable to suppress his desire for her...