"Servamp" is a supernatural action manga series that revolves around the concept of vampires and their human servants, known as "Eves." The story begins with Mahiru Shirota, a high school student who values simplicity and avoids unnecessary complications. One day, he encounters a stray black cat, which he names Kuro. Unbeknownst to Mahiru, Kuro is actually a powerful vampire known as Sleepy Ash, one of the seven Servamps—vampires who represent the seven deadly sins. When Mahiru accidentally forms a contract with Kuro by naming him, he becomes Kuro's Eve, binding them together.

The narrative explores the dynamics between vampires and their Eves, as well as the conflicts that arise from their relationships. The seven Servamps, each embodying a different sin, were created by Tsubaki, the first Servamp, who seeks to destroy humanity. Tsubaki's plan involves manipulating the Servamps and their Eves into conflict, aiming to bring about chaos and destruction. As Mahiru and Kuro become entangled in this larger conflict, they are forced to confront other Servamps and their Eves, each with their own motivations and struggles.

Key characters include Mahiru Shirota, whose straightforward and compassionate nature often contrasts with the darker elements of the vampire world; Kuro, the Servamp of Sloth, who initially appears lazy and indifferent but harbors a tragic past; and Tsubaki, the Servamp of Melancholy, whose hatred for humanity drives the central conflict. Other significant figures include Licht Jekylland Todoroki, the Eve of the Servamp of Pride; Hyde, the Servamp of Envy; and Lawless, the Servamp of Greed, each contributing to the intricate web of alliances and rivalries.

The plot delves into themes of loyalty, identity, and the consequences of power, as Mahiru and Kuro navigate their bond and the challenges posed by Tsubaki's schemes. The series balances action-packed battles with moments of introspection, exploring the complexities of the characters' relationships and the moral ambiguities of their choices. As the story progresses, Mahiru and Kuro must confront their own fears and weaknesses while striving to protect those they care about, ultimately challenging the fate imposed upon them by Tsubaki and the Servamp hierarchy.