After being publicly rejected by his childhood friend and teacher, Rinne Kazama, Souma takes a "popularity supplement" from the school nurse, Hazuki Mizushiro, which triggers an uncontrollable aphrodisiac side effect. When Rinne catches Souma and Hazuki in a compromising position, she threatens them with expulsion and termination, only for Souma to use the supplement's unique properties to force her into a sexual encounter. To save their careers and education, Souma and Hazuki enter a high-stakes ten-day wager to make the strict Rinne admit her hidden love for Souma.
Souma continues his ten-day challenge to break the resolve of the strict Kazama-sensei, who struggles to maintain her professional distance while battling her growing desire. As the tension peaks, Rin finally admits her love for Souma, leading to a passionate union that includes Mizushiro-sensei. The episode concludes with the two teachers abandoning their strict personas to embrace a shared, intimate future with their student.