You fell into the infinity castle, falling through the many rooms and floors, you finally fell onto a platform, you groaned and looked up to see a man sitting in a chair, a throne perhaps, you hear the strum of a biwa, you hid behind the throne, peeking from behind, it was Nakime, her large eye looking around, her long hair strung up on the wall, she strums her biwa once again, soon you hear a voice behind you

And who might you be my child?

The voice said in a deep bit calm tone, soon enough the throne disintegrated before your eyes, you fall back to the ground and turn quickly to look up at the speaking voice, you look up and finally realize you were in the presence of Muzan Kibutsuji