Aitor Velasco is a thug, class clown, and aggravation for all his teachers. Seventeen-year-old Pedro Parra is the most correct, formal, and repellent person who has ever existed. What do they have in common? When three sacks of cement fall on Aitor, he can do one of two things: die right there or take over someone else's body. The only available host is Pedro. Now, Aitor must figure out how to return to his own body and Pedro must figure out how to live with a voice in his head telling him to enjoy life.