Servamp

Mahiru Shirota lived a simple and fun life as a 15-year-old until he came across a stray black cat he named Kuro. Mahiru was shocked once he discovered Kuro’s ability to transform into a person, but soon realized Kuro was no ordinary cat when he disclosed his true identity as an ancient vampire who avoids blood and any movement. By mistakenly uttering Kuro’s name aloud, Mahiru created an unbreakable bond with him, making Kuro his servamp.
Things take a turn when a vampire called Tsubaki attacks them brutally, and Kuro drinks Mahiru’s blood to mark him as his master, also known as “Eve.” Tsubaki then reveals Kuro’s true identity as Sleepy Ash, one of seven siblings embodying the seven deadly sins, while Tsubaki himself represents the forgotten eighth brother, melancholy. Tsubaki declares war on both vampires and humans, putting Mahiru and Kuro in a race against time to warn the other servamps and their Eves, saving the world from a catastrophic war.