The secret of a female teacher: an unforgivable relationship

With her marriage close to her, Rika, a Japanese language teacher, has been transferred to a new school, and while she dreams of becoming a painter, she becomes close to Iguchi, an art teacher who has retired without realizing it. Iguchi, who has become more and more in love with Rika, who looks a bit like her divorced wife when she was young, is now in an unforgivable relationship with a young female teacher despite her age.