Formerly Kujakumaru and a one time friend of Bakunetsumaru, he joined Kibaomaru to gain enough power to seek revenge against Bakunetsumaru for sparing his life out of respect when he lost a duel to the Blazing Samurai. He also believes that surrender to Kibaomaru/the Dark Axis is the only way to end the civil war ravaging his homeland. Ashuramaru was later defeated in a death-duel against Bakunetsumaru, upon which he asked for his friend's forgiveness before transforming back into a GunSoul which was taken by the Dai-Shogun of Perfect Virtue.