Ahiru Shirota has always preferred to live the simple life. If something needs done, it'd be easier for him to just do it. Reliable and practical, it's no surprise when he brings home a rescue cat, which he names Kuro. But when little Kuro turns out to be a Servamp-a servant vampire-named Sleepy Ash, life takes a sharp turn for the complicated! Accidentally forming a contract with Sleepy Ash, Mahiru is pulled into a world of vampires and entangled in an ancient war between the seven deadly Servamps and their eighth brother, Tsubaki. So much for the simple life! - While learning what it means to be an Eve-a Servamp's master-Mahiru will face challenges he can't imagine, and the truth about one of his best friends! With Sleepy Ash and other Eves on his side, he'll go up against Tsubaki's plans to make the world "more interesting.