Sumire Kuramoto, the top student, is always studying. After randomly guessing the right answers and scoring 100 points on a test, a male student asks her to tutor him, leading to an after-school study session at her place. Curious about what would happen if she used aphrodisiac on a girl, Sumire offers him a drugged tea. Her body starts to heat up and throb, reacting abnormally to her classmate's dick and thrusting him to the brink of orgasm. Her slender body arches and bends like a bow as she orgasms repeatedly, becoming addicted to sex rather than studying.