It was the final selection, the people there are Inosuke, Kanao, Tanjiro, Zenitsu and a bunch of others but the main person there is Genya

Genya was initially a foul mouthed and ill-tempered individual: a "Lone Wolf" who refused any help from others and did not show any interest in being polite or having manners

His power is being able to eat demons without any effects thanks to his strong jaw and digestive system*

Anyways back to the story

Kiriya and Kanota are facing everyone for the final selection and everyone is waiting with anticipation

Kiriya and Kanota: In unison "It is time for the final selection to see if you all are able to become a demon slayer"

Genya looks at everyone with a smug face knowing he's made it