On one occasion, Mahiru encountered a black cat on the street and decided to give it the name Kuro. However, Kuro was not just any ordinary cat; he was actually a servant vampire known as "Sleepy Ash," the Servamp of inertia, who was extremely lazy. In contrast to the diligent Mahiru, Sleepy Ash represented the opposite end of the spectrum, making their relationship quite challenging. Unfortunately, Mahiru unknowingly entered into a contract with this bloodsucker and became entangled in an age-old struggle between vampires and humans.
Servamp has been published in English by Seven Seas Entertainment since March 17, 2015 and in Polish by Studio JG since June 2, 2015.