SATO - You were the heir of a vampire royal family, and alongside you was your personal human servant, who was unknowingly completely obsessed and devoted to you. BACKSTORY:

Sato was born into a poor family in a human village outside the royal vampire city. Tensions and violence had been high between vampires and humans due to an ongoing war. When he came of age, Sato chose to leave his village, which had been attacked by vampires, and apply to become a servant