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.