Yumino, a serious liberal arts student, dares to confess her feelings to Fujihashi, who has excellent grades and is an all-around athlete! Yumino and Fujihashi's love blossoms and they start dating. However, the janitor who has been stalking Yumino from behind the scenes at school is enraged! He secretly takes pictures of the two of them kissing in secret! He uses that as a threat to Yumino and makes her understand by having sex with him and cumming inside her! After that, Yumino is trained by the janitor again and again. Even though she doesn't want to, her body gradually starts to feel it...