After Mahiru Shirota rescues what he thought was an ordinary cat, he's pulled into the world of servamps. Life couldn't be more complicated.

Mahiru Shirota dislikes difficult things, preferring to live a simple life. But after rescuing a cat he names Kuro, life takes a turn for the complex. Kuro turns out to be a servamp-a servant vampire, named Sleepy Ash and the two form a contract. Kissing his simple life goodbye, Mahiru is pulled into the world of vampires, the seven deadly Servamps, and war. Life couldn't be more complicated.—Crunchyroll