Sena Hasegawa, a black-featured gyaru living in the dormitory of her husband's construction company. One day, while her husband is away on a business trip, she is caught dumping used diapers at the dorm's entrance. The elderly dorm manager scolds her harshly, but the very next day, Sena calmly repeats the same act. Pushed to their limits by her defiant attitude, the dorm manager and fellow workers take her to a construction site, assault her, and confine her against her will. Later, the dorm manager, who has taken photos of her actions, uses the images as leverage when Sena demands payment for her dorm fees, leading to another violent assault.