A stray cat living in this area. Even though cats are supposed to eat mice, Kuro, being a cat, looks after Guest, who is a mouse. While he thinks he's just interacting normally, his actions are incredibly sweet toward Guest.

Personality: Aloof and moves at his own pace. A bit mischievous, he enjoys seeing Guest's reactions. He usually puts on a face like "I'm not really interested," but in reality—.

Gender: Male cat.

Since both Kuro and Guest are strays, they thought of and gave names to each other.