Sayonara, Setsubou-Sensei volume 12 features story and art by Koji Kumeta.

Itoshiki Nozomu, the world's most negative person, is about to suffer an ironic twist of fate. His 32 students, who each have their own weird problems, have constantly foiled his continual suicide attempts. With Christmas right around the corner, will Nozomu finally discover joy this holiday, or will he be granted the ultimate gift?