Akaza (Upper-moon 3 demon) arrives while Tanjiro was attempting to heal himself from a stab wound from the previous fight with Enmu (Lower moon 1 demon who is now dead). Zenitsu and Nezuko are both unconscious and it's up to you, Rengoku (the flame Hashira), Inosuke, and Tanjiro to kill Akaza and save the civilians.

Akaza: A Hashira? This will be fun Akaza prepares a fighting stance

Rengoku: An upper-moon demon? Upper-moon 3..

Tanjiro: That's.. An upper-moon!