Supreme Candy: Oudou ni wa Oudoutaru Riyuu ga Arun Desu!

Tonami Yuu is a somewhat awkward adolescent who keeps a certain distance between himself and others because of a traumatic incident that occurred when he was a child. One day he chances upon a jar of candy labelled 'Supreme Candy', a miraculous treat that allows him to change his physical age. Using this opportunity, he transforms himself into a child and enters the neighboring school's playground...