Servamp followes Shirota Mahiru, the kind of guy who likes to keep things simple and hates dealing with complicated issues. One day, he picks up a stray cat he found starving on the street. The next day, when he comes home, he finds a person eating his food and watching his TV in the cat's place. A person who can transform back into a cat.
This person is Sleepy Ash, and is actually an incredibly powerful, shapeshifting vampire—one of the Seven Vampires of the Deadly Sins. The only problem is that he's the vampire of Sloth, and is incredibly lazy. However, after drinking Shirota's blood and donning the name Kuro, he becomes his servant and must fight against the mysterious eigth sin 'Melancholy' who wants to start a war between the vampires.
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