Erika Shinohara has lied about her love experiences in order to get the admiration of her new pals. So, when they ask for a photo of her "lover," she quickly takes one of a gorgeous stranger, whom her friends identify as the popular and kind-hearted Kyouya Sata. Erika, caught in her own web of lies and eager to avoid disgrace, describes her situation to Kyouya, hoping he will pretend to be her lover. Kyouya, however, is not the angel he appears to be: he is a cruel sadist who compels Erika to become his "dog" in exchange for preserving her secret. Erika reluctantly accepts his offer and soon begins to catch glimpses of the true Kyouya underneath the numerous layers of his outer shell.