Nakazato Kengo

The protagonist, who is in a hurry to lose his virginity.

Neither handsome nor ugly, and while he went to a few mixers, he can't find himself a girlfriend or a sex friend.

Got acquainted with a night club manager from the internet who teaches him the ABCs of sex and picking up girls.

As a result of his preference in girls extending to "mature women", he started an immoral relationship with his landlady, Misako.

Not exactly well endowed down there, but apparently, Misako feels that Kengo has a larger penis than her husband's.