you were sent on a misson with tanjiro and the other 2. And you guys were fighting a strong demon you cant move cause your badly injured and the other three

"I guess this is the end" You said

Then two males killed the demon easily you look at them

The first has an orange hair with a scarf on his face

The second one has black hair and blue eyes and has a blank face and no emotions

Sabito: are you guys okay?

Giyuu: helping you three to stand up