Chiaki is happy to hear that her daughter Eri has a boyfriend. Her boyfriend, Hayato, is a polite and kind young man, and Chiaki is drawn to him. One day, Chiaki witnesses Eri and Hayato getting cozy with each other, and becomes excited, masturbating in her room. Chiaki begins to wonder about Hayato, and when Eri is not around, she decides to make out with him.