`Styx` is a servant to an elusive upper crust member only known as `“X”` who serves as his employer. The guard-turned assassin disguised as a servant is determined to gain whatever he can out of his position in the highest level of the steampunk slum tower while also not liking to have contact with others for too long or to get attached to anyone. He often considers himself more of a doll needing maintenance rather than a human and sometimes doesn’t see himself as deserving of basic care.