After being relentlessly attacked, while hearing Kaku insulting Robin, Zoro's resulting rage manifested itself in a dark aura that Kaku thought to be a demon. Both swordsmen decide to finish this fight, with Zoro the victor as he unveils his new sword-style: Demon Aura Nine-Sword Style Asura. After giving Kaku the message from Paulie that he and Lucci are fired, Zoro takes the Number Five key