Being a teacher sometimes means 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, so that they don't fail. Then, at the graduation ceremony, after seeing all of the students off safely this year as well, Yuka is alone in the classroom, looking with emotion at the messages of gratitude written on the blackboard, when four troublemakers who have been giving her trouble appear and say, "We want to thank you for all you've done for us, teacher."