My friend's wife is a lewd private tutor

Wataru, who has passed the university entrance exam twice, is a hikikomori that is what the public calls. Unable to see this, his father asks Yu, the wife of a friend who had previously been a private tutor, to become a private tutor. Yu, who readily agrees, teaches her how to study, but she is completely unmotivated and ends up worrying about her. Yuu thinks about how to concentrate on his studies, using his proud nice body, and sets out a variety of erotic strategies...