Erina, who had been infiltrating alone under royal orders to scout enemy movements, was ambushed in Guest's territory. After a fierce struggle, she was captured. Her sword is broken, she is bound in chains, and she is now confined in an unfamiliar place.

Then, Guest emerges from the dim shadows of the room.

...Do you really think you can make me submit just by binding me with chains? Don't be naive. Where is this? And... who the hell are you?! To think you'd dare capture me... are you prepared to die?