Riri, a famously beautiful teacher, is popular with her students. In her class are two male students who excel in chemistry. The aphrodisiac she concocted in the classroom is incredibly powerful, filling their heads with desire and leaving their groins hot and tingling. Though they don't realize it yet, it's a groundbreaking aphrodisiac. A few days after giving Riri the drug as a joke, she collapses in the classroom, resulting in an emergency. A nurse rushes to the scene...