A devoted young woman has long dreamed of becoming the wife of her childhood sweetheart, whose feelings for her run just as deep. Their shared future is suddenly endangered when a monstrous attacker leaves him mortally wounded. She is then granted the power of a magical girl, yet discovers that each new ability demands she form increasingly intimate bonds with other men. As she prepares to take her first steps into this role, the true cost of saving the one she loves begins to reveal itself.