Man in a Noh Mask

"Oh."

A mysterious man who lives in the Umebachidou's basement. Wears a Noh mask and speaks with a slight stutter. He chases down Tamamori whenever he finds him, but seems to bear no ill intent. From Tamamori's perspective, however, the man's very existence is like an enemy to him.

Violent to anyone who isn't Tamamori, and beats both Kawase and Hanazawa to death without any explanation.

His goal is a mystery. His reason is also a mystery.

While Tamamori suspects that he has something to do with Minakami's suicide, nothing is known about him in the end. Judging from his voice, appears to be in his late teens. Despite appearances, he is one of Tamamori's love interests.

Spoiler

It is later revealed that Tamamori named him Kaoru after their fateful encounter.