After losing her job due to temporary layoffs and being kicked out of her boyfriend's apartment, Rin is tired of the coldness of the city and finds a job as a live-in dorm mother. The dorm is full of dull people, such as Koshinzuka, who keeps failing exams, Takinogawa, who is a shut-in, and Arakawa, who is unemployed and in the middle of divorce mediation. Rin is struggling alone, but her ex-boyfriend (who actually has a child) comes to visit her... She holds back her loneliness and bounces her huge breasts as she warms up the dorm with her cheerful and sexy attitude today!