Eri fell in love with her fellow elementary school teacher, Masato, and married him. She was happy with her marriage. One day, by chance, she met her former senior teacher, Kimura, in the neighborhood. Eri learns that after she retired from work to get married, she had a dispute with parents over a bullying issue and was forced to resign from her teaching job. Kimura, who gave the impression of being active and lively during his days as a teacher, is now a shadow of his former self, and Eri feels sympathy for him. However, Eri had no idea at the time that their reunion was not a coincidence but a natural part of Kimura's plan, and that she would soon be pushed into a relationship with him.