"If I could start over as a kid," is a fantasy that everyone has at least once. This old man has happily become a kid, but he arouses the lust of the busty health teacher and has sex with her, disguised as a childish prank! He trains the innocent girl, who has feelings for the owner of her body, to squirt, and penetrates her with an ahegao face! And then, he makes the homeroom teacher cum over and over again with humiliating play in the staff room where people are present!