The story takes place in an alternate reality where a small percentage of children manifest superhuman abilities upon reaching puberty. A focus is placed on Yuu Otosaka, a high school boy who awakens the ability to temporarily possess others, which brings him to the attention of Nao Tomori, the student council president of a school founded as a haven for children with such abilities. In an alternate world, a small percentage of children are able to manifest superpowers upon reaching puberty. Yuu Otosaka, a boy who awakens the ability to temporarily possess others, hopes to use his power to live an easy going high school life. However, he is caught red-handed by the mysterious Nao Tomori and is forced to transfer to Hoshinoumi Academy, where he and the other student council members must help students who have trouble controlling their abilities.