Known as an elite private tutor, Riho is hired to help a dimwitted son improve his grades. As the boy laments his poor academic performance, Riho resorts to sexual services like handjob and blowjob techniques to boost his motivation. When the father takes her for himself, her hidden masochistic side is uncovered, and she's rewarded with facial cumshots during doggy-style play. After that, Riho becomes more focused on teaching through sex than actual academics. Soon, she begins her "pussy lessons" with the son and his friends.