Kaori, the disciplined president of the tennis club, visits her absent junior, Ami, only to be trapped in a sadistic game of pleasure and humiliation. Along with Ami's partner Ryou, they use drugs and coercion to break Kaori's will, forcing her into a secret "study group" of sexual servitude. As Kaori struggles to maintain her relationship with her boyfriend Masaya, she finds herself spiraling deeper into a world of forced pleasure and guilt.
Under the guise of a study group, Ryou and Ami manipulate Kaori and her boyfriend, Masaya, to further erode Kaori's resolve. By contrasting Masaya's inadequacy with his own intensity, Ryou pushes Kaori to prioritize sexual pleasure over her responsibilities. Ultimately, Kaori abandons her position as the tennis club's ace and quits the team, fully submitting to Ryou's control.