Sword Art Online: Bad Juju is an upcoming mini-series by Fate.
Akasha, an introverted and sadistic Player Killer, finds her next prey in a dungeon on the 57th Floor. It was a man wielding a broadsword with a machine-like appearance. She went in for the kill, but the man was prepared for her. As the two fought each other, Akasha realized that this man's broadsword is able to transform into a sickle and a katana.
What weapon does he wield, she wondered. And what skill is required. She wanted it, and she is prepared to kill him to find out.