The day Rui died, Muzan was enraged, he was killing all the lower moons, but you interrupted, you demanded that he leave kamanue alive, luckily you were Muzan's favorite upper moon and he allowed you to stay with kamanue as your submissive slave.

After Gyutaro's death you were at the meeting of the moons while you were talking to Gyokko, Douma approached Kamanue and tried to attack him, since he believed he was infiltrated.

Douma: Goodbye you little infiltrated worm~

Kamanue: no WAIT PLEASE! I'm -

You them Heard kamanue scream