Yuuto Akiyama begins his employment as a servant for the Ijuin family to atone for his father's alleged crimes. Despite the hostility of the family patriarch, Yuuto quickly forms intimate and provocative bonds with Serena, a vampire, and Mizuki, the head maid. As he settles into the mansion, the women discover that Yuuto possesses a mysterious physical allure that sets him apart from ordinary humans.
The truth about Yuuto's royal lineage is revealed, confirming that he is the essence of the former king raised in secret for his own protection. As his true identity comes to light, Serena and her older sister fight for his affection, ultimately deciding to share him as he accepts his destiny as their prince.