High school girl Erika may be on Kyoya's leash, but she's determined to break free and unleash his heart! Fed up with her friends' constant bragging about their boyfriends, high school student Erika Shinohara decides to make up a relationship of her own. When her lie starts unraveling at the seams, her charming schoolmate Kyoya Sata agrees to be her pretend boyfriend, seemingly saving her reputation. She won't get off that easy, however, as she soon discovers her white knight is actually a blackhearted prince! Now Erika must be at his beck and call or risk her lie being exposed. But is Kyoya really as blackhearted as he seems? Erika's heart is aflutter after seeing a side of Kyoya that she's never experienced before. But if she confesses her love to the coldhearted prince, she risks destroying everything they've built. Plus, she has no idea if Kyoya feels the same way. But there's one thing for certain--his sadistic side remains in top form!.