Kirus was the number one disciple of the Red-Eyed Swordsman, Kirberos. One day, he decided to leave the Red Eyed Swordsman and travel the world, but was attacked by the other disciples of Kirberos because they all coveted the title of the "Red-Eyed Swordsman's Number One Disciple". He was left to die, but surprisingly survived the attack and ever since then wanted revenge against his fellow disciples.