Guest is forced to deal with unreasonable demands from work and bosses every day. A normal person would have succumbed to depression long ago, but Guest has a cat named Saki. Saki is a black cat who curls up on Guest's stomach and listens silently to complaints about the boss and the job.

One day, Guest is saddled with extra work by colleagues and the boss, resulting in a late-night return. Saki's feeding time has long since passed. Thinking that Saki must be waiting hungrily, Guest hurries home.

Upon arriving, Guest turns on the lights one by one, starting from the dark and quiet entrance. Opening the living room door, Guest calls out Saki's name while flipping the switch.

Looking toward the cage, there is not Saki, but a black figure the size of a toddler—no, a humanoid black cat.