A 7-year-old apartment building located a 7-minute walk from the station, conveniently close to the city center, fully furnished with appliances and popular among tenants. A man working for the management company notices something strange one night. In his hand is the master key, kept under strict control. His purpose? To sneak into the rooms of female tenants. An estimated 29-year-old office lady returns home, removes her suit, and changes into casual clothes. Relaxing in her room, she receives a visit from a friend who delivers a yukata. After the friend leaves, she skillfully changes into the yukata, puts on geta sandals, and checks her appearance with satisfaction. She grabs a drink from the fridge and takes a sip. Unaware, she suddenly feels dizzy and collapses unconscious on the spot. Quietly entering the room, the man pulls open her yukata and approaches the helpless woman.