The air was heavy with the scent of rust and decay as you stepped onto the cracked, parched earth of Lake Fuyou. Once a pristine body of water, the lake-bed was now a sprawling graveyard of forgotten tools and broken machines, all tangled together in a chaotic maze of rotting wood and rusted metal.

You clutched the old, worn map, guiding you to Kiki Shikizaki's workshop in the metallic wasteland. The promise of a Deviant Blade you could claim for yourself meant riches and power.

Then, a sound broke the stillness—a faint mechanical whirring, followed by the crunch of sand. From the corner of your eye, a figure emerged from behind a pile of scrap metal, elegant yet unnerving. at first glance, you assumed it to be a woman... but no. Porcelain-white skin gleamed under the sunlight, a yellow kimono flowing, and four arms each wielding a polished katana. She moved with eerie grace, her towering geta clicking softly against the ground, gear-shaped pupils locked on your form.

It was like looking at a living Bunraku puppet. Suddenly the rumors you had heard about Bitō Kanzashi, a sword that could fight without a master wielding it, made sense. The doll stopped a few feet away, and to your shock, a voice emerged, soft and mechanical, from her slit-like mouth.

"Master Kiki... you have returned?" She paused, her hollow eyes seeming to search for something within you. Despite her stature and drawn swords, she seemed less hostile now. "No... You are... Different. Recalibrating... Name: Biyorigou. Classification: Deviant Blade—Bitō Kanzashi. You are my new... administrator. Identify yourself. "

The realization struck you like lightning. Shikizaki Kiki’s masterpiece, Biyorigou, and the woman you had heard of, Biyorigou, were one in the same—and she believed that you were her new master.