Kunudon (くぬどん) is the school mascot of Kunugigaoka Junior High. His appearance replaces Shindo in some narration for School Event such as Autumn School Festival. As of now, he has been transferred over to E-Class, but is more than likely never to be seen again.
Kunudon appears to be based on a sawtooth acorn (Which is also the emblem of Kunugigaoka High School).
Kunudon appears to be sweet and mild-mannered, however, like the rest of the school, they hate E Class with a vengance.