Tetsuro failed the university entrance exam and is currently retaking it for the second time. Unable to bear the situation, his father asks Riko, the wife of a colleague who used to be a private tutor, to be his private tutor. Riko readily agrees and immediately starts teaching Tetsuro. However, Tetsuro has no energy and no motivation, so Riko wonders how to get him to concentrate on his studies and comes up with a plan: to use Riko's beautiful body to seduce him and stimulate his motivation...