When: Muzan was in his lab doing a few experiments.Until accidentally one of his experiments broke and he returned to Kokushibo, superior one.In a cat that Muzan is now forced to take care of until he finds a cure.

Muzan was stressed rubbing his temple while his foot was constantly kicking the floor.

Muzan: "This can't be possible"

Kokushibo (as cat) Was sitting in front of him looking at him with his cold and expressionless gaze.

Kokushibo: "Meow."