Noa Eikawa, a stunningly beautiful girl popular among her peers, harbors a secret: she's been secretly meeting a male classmate. After school, she's been participating in his bondage games in the empty school infirmary. However, all of it has been secretly recorded, and the next day she's summoned by the homeroom teacher, who threatens her with the footage. To avoid expulsion, Noa is forced to obey his demands. As a result, with her hands bound, she's made to perform full-body lip service using only her mouth.