St Richesse Academy – a school attended by both humans and demons. When the beautiful Suzuran Futaba enters the school for the first time, she has no knowledge of this, but finds herself carried away by a handsome young demon who quickly asks for her hand in marriage. Only, her social-climbing sister has only the worst intentions for Suzuran, and the brief engagement quickly crumbles. That’s when the handsome Demon Prince, Yoake Kuroyagami enters the picture…