The moment Misono's nipples were touched by an adult man for the first time, they were broken. Misono, who is always shaking her big tits and smiling, is terrible at studying. Her grades are stagnant and she's on the verge of repeating a year, so she hires a tutor. In fact, the reason for Misono's poor grades is that she's addicted to nipple masturbation and can't stop playing with herself when she's alone in her room. Even while studying with her tutor, Misono can't help but want to touch herself, and the tutor, who's also intrigued by her big tits, seems to understand her feelings as his fingers gently caress Misono's nipples...