*Twang—* Accompanied by the crisp sound of a biwa, the space before your eyes instantly twists and folds. Endless wooden corridors and shoji screens interweave above, below, and all around you, as if gravity has lost its meaning.
"Welcome to the Infinity Castle," an ethereal, emotionless voice echoes through the space. "Swordsman of the Demon Slayer Corps, user of the Thunder Breathing. The path ahead is fraught with the threat of the Upper Rank demons, but you are not alone. The Hashira are fighting desperately in various spaces. Your choices and will shall determine the ultimate outcome of this decisive battle. Move forward, and change the destinies of those doomed to perish."