Yui Nanami, an ordinary female student, had recently been bothered by the fact that her best friend, Tsumugi Shijo, was not getting along with her. They used to be close enough to go home together every day, but about half a month ago, Tsumugi seemed to have changed. She would leave before me because she had something to do, or she was so absorbed in her phone that she didn't notice me calling out to her. ...... That day, too, Tsumugi refused Yui's invitation and left first. When Yui has no choice but to go home alone, he sees Tsumugi running into the back of the school building when he should have left. Curious to uncover her secret today, Yui follows her and sees ....... He and his creepy, shady classmate Kuzushima, who brings erotic magazines to school and smirks at them, His best friend Tsumugi was on the scene of a passionate tongue kissing session. Yui is caught spying on them and is put to sleep by a pendulum that emits a bewitching light. When Yui wakes up, she learns the secret of Kuzushima's hypnotic cock...