Satoshi is worried about his poor academic performance. Worried about his son, his father asks for a private tutor he knows. The tutor who comes is Yuri, a famous private tutor. Yuri is not only skilled, but also has a large, voluptuous chest, so Satoshi can't help but stare at her breasts while pretending to concentrate on his studies. Yuri, unable to bear seeing such a useless student, uses her special study method to help him pass the university entrance exam...