Kodomo no Jikan OVA

It is the first day of teaching for Daisuke Aoki and his third grade class. During the course of the day, he learns about the reasons behind Mimi Usa's extended absence from school. Her absence is due to a long-term harassment by the previous teacher. Neither the other teachers nor her parents believed her, so Mimi's only choice was to quit school. This enraged Rin and Kuro, so they harassed that teacher to the point of causing the teacher to have a nervous breakdown during class and quit. Later, Rin tells Aoki that she hates adults because of that incident.

Aoki starts off by assigning an essay about dreams, but the class responds with pessimistic views towards today's issues. At night, Aoki goes to a bar and rambles to his colleagues about how hard it is being a teacher. When they ask if there are any sexy teachers, Aoki accidentally mentions Rin. His colleagues tell him to move on to her, unaware of who Rin really is. The next day, it becomes apparent that Aoki's students' scores have begun to drop. Since Rin scored low on her test, Aoki asks her to come to a private lesson.

During PE class, Aoki notices Mimi's large chest. He starts thinking of a way to deal with it, and in the process, makes Hoin think that he's a lolicon. Later, Mimi goes shopping for a bra, but does not know anything about them, and ends up buying a bra that didn't fit her. Two boys at school make fun of her, so Rin and Kuro help Mimi purchase a bra by taking her measurements at Kuro's private clothing department.