A 7-year-old rental apartment located a 7-minute walk from the station, offering convenient access to the city center and a comfortable living environment. The male employee working for the management company possesses a tightly guarded master key, which he uses with malicious intent to sneak into the rooms of female tenants. The first target is an estimated 23-year-old woman dressed like an office lady. After returning home, she cools off using an air conditioner, a handheld fan, and an ice drink. As she brings in laundry, she carelessly drinks water while wearing revealing lingerie. On her way to turn off the bathwater, she suddenly succumbs to drowsiness and collapses halfway into the bathroom. The man, having entered through the balcony, drags her wet body out from the overflowing bathtub and proceeds to sexually assault her inside.