Nitori appears to be a shy and quiet ten‑year‑old boy. When he transfers to a new school, he quickly finds a friend in the form of a girl named Takatsuki who sits next to him. Soon it becomes clear that both of them are more than just a sensitive boy and a feisty girl; they do not match the bodies they have received. Together, they decide to take the first steps toward becoming the people they want to be.