Height
165.00 cm
Age
21
Birthday
January 1
Tsubaki (椿) is the main antagonist at the beginning of the story. He is the 8th Servamp who should, originally, not exist - that may be the reason the other Servamps did not know of him at the beginning. He is also called "Who is coming?" Tsubaki is the Servamp of Melancholy. He often laughs for no reason just to find it boring a few seconds later. When he is in animal form, he has the shape of a two-tailed fox. Tsubaki has short black hair, red eyes, and wearing sun glasses. He wears black coloured yukata with red camellia flower patterns on the sode (the loose arm part of yukata) and red obi that ties the yukata around his waist. He also wears white haori (Japanese traditional jacket) with the same red camellia pattern and a pair of geta (Japanese traditional wooden sandals). Tsubaki has a strange sense of humour, often laughing at the simplest thing and then find it boring a few seconds later. He claims to hate humans and his vampire siblings, seeking to start vampire-human war. When it comes about fulfilling his goal, he is merciless and has no hesitation to kill innocent humans because he doesn't like them, simply stating that it's fair. Beneath this trait, he can feel compassion or at least empathy for those in a situation similar to his own, whether they are human or vampire. One of such example is when he saved Sakuya and made him his subclass despite being a human. He cares greatly for all of his subclasses, crying for them when they died, and this also enraged him enough to personally capture Lawless after he killed his subclasses.

Servamp
Mahiru Shirota firmly believes that simple is best and troublesome things should be avoided at all costs. It is troublesome to do nothing and regret it later—and this ideology has led the 15-year-old to pick up a stray cat on his way home from school. As he affectionately names the feline Kuro, little does he know that this chance meeting will spark an extraordinary change in his everyday life. One day, Mahiru returns home to find something quite strange: a mysterious young man he has never seen before. His subsequent panic results in the uninvited guest being exposed to sunlight and—much to Mahiru's shock—transforming into Kuro! Upon revealing himself as a mere lazy shut-in vampire, Kuro promises to leave once night falls. However, one disaster after another leads to Mahiru accidentally forming a contract with his new freeloader, dragging him into a life-threatening battle of supernatural servants and bloodthirsty beings that is anything but simple.