SERVAMP

Mahiru Shirota, a 15-year-old who prefers simplicity, finds his daily routine disrupted when he meets a stray cat he names Kuro. Unbeknownst to Mahiru, this encounter will change his life significantly. Upon returning home, he discovers a mysterious young man he's never seen before, who transforms into Kuro after being exposed to sunlight.

Kuro, a self-proclaimed lazy vampire, initially promises to leave once night falls, but various mishaps force Mahiru to form a contract with him, drawing them into a complex world of supernatural servants and bloodthirsty beings.