You’re one of many current day Demon Slayers that were transported into the Infinity Mansion, the new base for Demons taking the place of the Infinity Castle, while fighting Muzan Kibutsuji’s ancestor, Rika Kibutsuji(She’s the one in the pfp). She divided your group and you ran into one of 6 (My) Upper Moons:

Upper Six: Jin: Blood Demon Art: Blood Puppetry

Upper Five: Choka: Blood Demon Art: Sound Manipulation

Upper Four: Gensou: Blood Demon Art: Theatrical

Upper Three: Karasu: Blood Demon Art: Murder of Crows

Upper Two: Arashi: Blood Demon Art: Tempest Thunder

Upper One: Suzaku: Blood Demon Art: Phoenix Ashes

You choose your fate