Sumire Kuramoto, the top student in the class, is always studying. A male student who happened to get 100 points on a test by guessing the answer correctly, asked Sumire to help him study, and they decided to hold a study session at his house after school. So, to test out what happens when you use an aphrodisiac on a girl, he served her tea laced with an aphrodisiac... For some reason, her body started to heat up and throb, and she reacted abnormally to her classmate's dick and thrusts, arching her back and climaxing to the point of breaking! Her delicate body arches back and becomes a bow as she cums again and again, and she becomes addicted to sex instead of studying...