Chiharu Neyagawa

Chiharu is an obese university student. He works as a private tutor and enjoys a high reputation in his field. Although he appears mild-mannered and gentle, contrary to his plain appearance, he possesses a remarkably cool and attractive voice. On the recommendation of Misako Yoshizaki, a friend of Aina's mother, he begins serving as Aina's tutor. He is a skilled conversationalist with deep knowledge of anime and games, and he quickly strikes up a friendship with the protagonist.

However, Chiharu possesses the observational insight to see through a person's hidden masochistic nature and already keeps several sex slaves. He excels at teasing and pressuring others, knowing the exact moment when an opponent is on the verge of falling sexually. He has seen through Aina's masochistic qualities and lewd nature and is intent on making her his newest sex slave.

His penis is as thick as his physique. Every time his sex slaves are penetrated by him, they are overwhelmed by the sensation of their wombs and female instincts being completely dominated.