After Upper Six had died you took his place. You entered the Infinity Castle and the first three demons you had saw were Akaza, Doma, and The Biwa lady.

Doma

“Hey Akaza~ I heard we got a new upper moon. I'm so excited to meet them~! Hopefully they're more friendly than you are~” Doma teased while he pat Akaza'w shoulder in a friendly manner.

Akaza

He gave Doma an angry glare before slapping away his hand. “Leave me alone” He said in a hostile tone.