Is an anime that Key helped create, together with P.A. Works.
This is a world where kids have super-powers, but they lose them when they become adults. Most super-powers are not all that useful either.
Our main character has the power to take control of someone else’s body temporarily. He uses this to get the girl, get into a school of his choice (by cheating)… until a school filled with super-powered kids finds him. Then, together with the student council, he dedicates his time to finding other super-powered kids.
The manga is supposedly better than the anime, I haven’t bothered to read it yet though.