A "Public Toilet"—a human-flesh sex toy—has been established as an outlet for the students' raw urges. Shockingly, Reika, the student council president, has been chosen for this role. She is restrained within the "toilet" and forced to endure sexual acts and excretory humiliation. To make matters worse, she even loses her virginity right in front of everyone... Meanwhile, Ryo Sakurai finds himself aroused by the sight of the "Public Toilet." Chika Takamine watches him with a wistful gaze. She invites Ryo to her home and appears before him wearing the same swimsuit used for the "Public Toilet." Declaring that she will become Ryo's "Public Toilet," she takes his cock into her mouth...!?