Hiroshi and Yuka have known each other for a while, and they often visit his house. Eric is Yuka's mother, and she raised Yuka alone since she was young. As a single mother, I have loved her for a long time. She seemed jealous when she saw her daughter happy with her boyfriend. Hiroshi has worked part-time as a porter since he was still a student, helping him build a strong body. Thorny is attracted to him, so what did he do so wrong … he cheated on his daughter's girlfriend! Hiroshi also secretly admires Eri's body, so when he teases her, he quickly confesses and begins an abusive relationship …