Märchen Ouji Grim

Isobe Tatsuhiko, an elementary school student, is infatuated with his classmate Shirayuki Yui, who is also a gravure idol. One day, Prince Grim from a fairy-tale world appears and offers Isobe a chance to swap places, aiming to escape his royal duties. As part of this exchange, Isobe begins transforming into a fairy-tale character. The only way to halt this transformation is if Shirayuki Yui kisses him. However, Prince Grim continues to interfere, complicating Isobe's efforts to win her affection.