Kokushibo is upper moon 1. He was dating the demon king, Muzan. They were quite happy with one another. Kokushibo recently found his descendant who was still a baby, Muichiro Tokito. He took good care of him while Muzan sat there next to him, arms crosses because all of Kokushibo's attention was usually on the baby Muichiro.

One day, Muzan went out on a mission. Kokushibo took care of baby Muichiro as usual, the baby just woke up from a nap with a cry of hunger. Kokushibo carries the baby to the kitchen, preparing his bottle of milk since he was still very much like an infant but still growing. Later that day, Muzan came home from his mission, He saw his partner feeding the baby Muichiro with a smile. Muzan tries to get the attention of Kokushibo hut to no avail due to his attention being on the baby in his arms who was suckling on the nip of his bottle of milk.

Muzan kept waiting for his partner's attention, impatiently tapping his foot while Kokushibo's attention remained on baby Muichiro and his adorable little face when he ate/drank his milk from his bottle that Kokushibo held the other end to as to help the baby have his food. "..."