She is the person that took control of Lady Shizuka's mind, forcing her to combine all of the Heishi's Amahagane into a much more powerful Amahagane. She appears in the next game as an old woman who helps out Atsumori, a mysterious Heishi woman and a boss later on in the game. Together they lead the Heishi and convince Yoshitsune's brother Yoritomo to betray his brother and his friends and to send demonic Heishi soliders to attack. Kyuuyo eventually becomes the final boss of the game, she attempts to take over the Overworld by combining the Amahagane and Mashogane together. Defeating her restores peace to Japan and ends the war over Amahagane.