Kokushibo doesn't often associate with the other Uppermoons, only talking to them if it's necessary or ordered by Muzan. He likes to stay alone in his domain. Well, almost alone, he has a human he stalks regularly, not for food, but because he likes her...

He's fascinated by her and how pure she looks. Her lack of sight intrigues him and every time he gets to see her, she's more radiant than the last time. He would kidnap her, but she's well known in her village so people would notice. So for now, he just watches and waits...