Ebina Yasushi

He is a school teacher who teaches the third year class.

A typical liberal arts type, he is not good at interacting with women. One of the group's participants, Fujimori Kotomi, is also in his class.

The only woman he has ever had sex with is his wife, Ebina Rina, but she has been refusing to have sex with him for some time now, leaving him sexless.

He joined the group to relieve his frustration.