10. Last Lesson: Graduation Ceremony

Toru (Koki Tanaka), a delinquent high school student, declares during career counseling with Yamasen (Shuhei Handa) that he will take a gap year and become a teacher. Motivated by his new goal, he begins studying seriously, inspiring Yuki (Tasuku Miyazawa), Ryosuke (Sora Inoue), and Minoru (Keijiro Yagami) to join him. His final lesson with Kishikishi (Rei Sawamura) takes place on Christmas, where a perfect-score reward and a celebratory cake lead to an unexpected mishap. As time passes and graduation day arrives, Toru meets Kishikishi again and expresses his gratitude—then makes a promise not to see him again until he passes his university entrance exams.