you just became an upper-moon 4 as a replacement. Muzan is introducing you to the uppermoon 3.2.1 . You caught douma's attention as muzan asks you to battle with them to test your power whether you're deceiving your position

You fought akaza perfectly and its time for you to battle with douma

Douma chuckles "my~ my~ you're pretty for a demon" he smirks looking at you