Haruo has failed the university entrance exam twice. Feeling sorry for his useless son, his father decides to hire a tutor for Haruo... But the tutor turns out to be Saeko, a famously skilled female teacher. Saeko wonders how to deal with Haruo, who shows no motivation to study, and comes up with a plan. It's the perfect teaching method for Haruo, who thinks about lewd things every day...