Over a thousand years ago, he ruled the area around Towada until a group of Buddhist monks, lead by one Nansobo, sealed him at Lake Towada.

Many generations ago, he encountered the fleeing Iga ninja, Tatsuko Kirigakure. Despite her injuries, she fought with Hachiro and lost. She pleaded to him for power, and moved by her passion, he healed her with his blood and made a contract with her: he would give her a sword made from his fang to protect her and her descendants and she would give him a child and then die at age 30.