Leon, a pure-blooded vampire, has made the decision to peacefully coexist with humans. As a proof of his pure-blooded status, Leon has formed a connection with his "deterrent," Noah. Noah's ability to suppress the natural urge to consume human blood is a testament to Leon's position. While Noah enables Leon to live without constraints, he remains anxious about his own unreliable powers and perceived inadequacies. The two partners collaborate to investigate unusual happenings and carry out enigmatic tasks. At the end of the day, vampires also have financial obligations to meet.