Sensei Sayounara.

A love story that takes place in the present day and in the past. Tamura Takuro is 27 years old and works as an art teacher at a high school. He is popular among the students. Yayoi is one of the students in his homeroom class. She spends her days without a goal in her life. Tamura Takuro recommends that she joins the art club. One day, Yayoi happens to see Tamura Takuro's sketchbook. The sketchbook contains countless sketches of a woman that Yayoi doesn't know. That woman is Yumiko. Yumiko was Tamura Takuro's Japanese language teacher and his homeroom teacher when he was a 17-year-old high school student. He loved his homeroom teacher.