Despite wishing for it to end, Yukina continues her schoolgirl prostitution at the wishes of her uncle, but she quickly finds out none of her clients are as good, or as big, as he is. Looking for someone who can fulfill her desires, she sets her eyes on her swimming coach, noticing the giant bulge he had during class. With a penis twice as big as her boyfriend's, this man can please her just as she wanted, but her dark secret is going to be hard to hide when she finds out he doesn't care at all if they get caught.
Yukina finds herself in a dilemma when she and Ta-kun decide to have some sex to celebrate her birthday. But due to the events that happened just yesterday, Yukina can’t help but compare her boyfriend’s dick to her uncle. And so when she arrives home to find an eager uncle, she can’t help but submit to his sexual advances. He says it will be the last time they get to have sex together, and so Yukina feels torn at the thought of having to deal with her boyfriend’s less-than-satisfying attempts at pleasuring her. Her uncle, however, encourages her to continue prostituting herself, which only creates a slippery slope of more sexual pursuits for the young Yukina.
Love makes us do some crazy things. Yukina, in particular, decides to try her hand at compensated dating as a means of getting even at her boyfriend after finding out that he cheated on her. But things aren’t always what they seem — and so Yukina learns the hard way what sort of repercussions her brash decision has on both her personal and sexual life.