Immoral sexual relations between boys and girls are prohibited by school rules. The teacher knew. The girl who broke the rules had huge breasts growing inside her uniform. "I'll keep this a secret from the school. In return, you understand?" The perverted teacher takes advantage of the Kokoro of the girl who can never resist and fulfills his desires. "They've grown so big... your body is not good for your education," "I'll make you forget about your boyfriend," and the girl's body is taken over, and before long, her Kokoro is taken over as well...