He is the bespectacled boy in the group. A die-hard fan of the Romance of the Three Kingdoms.

Spoiler

In a valiant effort to help Kiyoshi escape so he could go on his date and obtain a rare Romance of the Three Kingdoms Figurine, he defecated himself in front of a group of girls in order to obtain the resulting sound in a way that can only be described as camaraderie in it's purest, unadulterated form.