Is Sakamoto A Pervert? / Classroom Scene Omnibus / The Summer of Sakamoto's Disappearance.Is Sakamoto A Pervert?: Kakuta, the class' physical education teacher, tries multiple times to catch Sakamoto breaking school rules, but fails miserably. He finally gets his chance when he catches Sakamoto eating in health class, but it is revealed that it was all just a plot to feed an injured bird.
Classroom Scene Omnibus: In cooking class, Kana-chan encounters a slug inside a cabbage, which Sakamoto skillfully gets rid of. In art class, which involves drawing each of the students' partners, Aina pairs herself with Sakamoto. As it seemed that Sakamoto sketches her as an orangutan, it is revealed that she viewed the art in the wrong way and its true form is quite beautiful. After a fire breaks out in the school, Sakamoto rescues Acchan, who was left behind in the school toilet after everyone evacuated.
The Summer of Sakamoto's Disappearance: After Acchan and his fellow delinquents accidentally have Sakamoto fall down a hole they dig as a prank, they go on a search for him after his disappearance extends to a week. When they only find his button inside the hole, they assume that Sakamoto had used Acchan's trap to get to the other side of the world, though later it is revealed that this is not the case, as the hole is actually shallow. Sakamoto had entered the trap on his own, in believing that they were digging for a hot spring and that he could help.