After an experiment of Merlin's goes wrong, Melissa not only find herself at the age of fifteen again, but they also find herself in the world of Bnha, where people posses quirks and can become heroes or villains. Found by a cheerful boy, she stays with him as she is enrolled into U.A. She's learning to be heroes while also trying to find a way back home. Can she find a way back home? Especially with her classmates, teachers, villains and friends becoming obsessed over her?