Yuzu Kitagawa is a high school girl. She gets along well with her classmates and lives an ordinary school life. With hopes of going to college, she is deceived by her homeroom teacher and a university professor and becomes a guinea pig for research. A university specializing in the medical field expands Yuzu's anus and inserts foreign objects into her body, and the man watches her twitching anus! He thrusts his dick into her two wide-open holes and makes her climax!