Rinko works at a dilapidated hot spring inn. She had a past where she left her son behind and left. A solo traveling college student arrived at the inn. He was surprised to see Rinko. It turned out he was the son she had left behind. Rinko was also surprised and approached him, saying he had grown up, but he yelled at her not to act like a mother and left the room. Late at night, as Rinko soaked in the hot spring, he entered. Both were startled. However, he became excited by Rinko's nakedness and attacked her. Rinko slapped him and left the bathhouse. Later, he secretly appeared in Rinko's room, saying he had always been lonely, and clung to Rinko's breasts...
