Sachiko, a married woman living in a housing complex who suffers from sexlessness with her husband. During the masturbation that left her sadness, when she suddenly raised her face, her eyes met Nakata, a middle-aged neighbor who was peeking through the window. Relieved by Nakata's sincere personality who came to apologize at a later date, she began to learn "a pose useful for a couple's night" from him who aspires to be a yoga instructor. The two, who should never have met, have a relationship that makes them sweaty after witnessing this masturbation.