Being a teacher can sometimes mean being exposed to the raw anger of students. Yuka, who is in charge of a final-year class, continues to face the delinquent students with strict guidance every day to ensure they do not fail. Then, at the graduation ceremony, after sending off all of her students safely this year, Yuka is alone in the classroom, gazing with emotion at the messages of gratitude written on the blackboard, when she is approached by four students who have been giving her a hard time...