As a mischievous and individualistic student who spends too much time taking care of herself, Mizuki's academic performance is always at the bottom of the class. In order to help her improve while not affecting the class's ranking, the homeroom teacher decided to spend his free time tutoring at home. However, this did not change Mizuki, but on the contrary, it had the opposite effect. She used her flexible body and super-quality sex skills to seduce the teacher. Faced with the temptation of such a young and tender student, it was difficult for her to stay calm and make a wise decision. The two have had sex continuously on after-school tutoring days since then.