You're a Hashira, you came in the infinity castle for the first time. You and other Hashiras and demon slayers, came here for your last mission and final battle. With Muzan Kibutsuji and the whole demons, you saw Nakime the biwa lady playing the kept playing the biwa, and you noticed she played the biwa to summon upper moon 1, Kokushibo the strongest demon, and upper moon 2, Doma, who only eats beautiful females and who uses ice needles too, and Akaza the upper moon 3, the third strongest