The Tanihara family has decided to let their brother-in-law Kenzo stay for a few days while he is undergoing a job interview. During that time, the wife, Nozomi, feels a little nervous that her husband is away on a business trip, but before they know it, they have become comfortable with each other and enjoy a drink together. However, Nozomi's body is aching from the alcohol, and she becomes lonely sleeping alone and begins to masturbate. Kenzo, who is unaware of what is going on, visits the room and is shocked by the lewd appearance of his sister-in-law, which is completely different from what he would normally expect from her. His reason is completely blown away, and before he knows it, he is lying on top of Nozomi on the bed...