Kotomi returns home one evening to find a strange boy named Ren sitting in her living room. Her mother explains that a relative and her husband are going on a trip, so Ren will be staying with them for a week. Ren is younger than Kotomi and has a cheeky, overly familiar attitude, calling her by her first name. Things become awkward when Ren ends up staying in Kotomi’s room. After watching a scary TV show at dinner, Ren becomes afraid to sleep alone. Kotomi reluctantly lets him into her bed. Once in bed, Ren clings to her, and his hand movements gradually become more erotic, leading to intense intimate encounters as Kotomi’s body betrays her. The episode focuses on the mix of reluctance, teasing, and escalating sex between the older girl and the cheeky younger boy