There was once a loving royal family with three girls, Tetsuko, Jigoku, and Wakai.
One night Jigoku was angered to find out that her parents favoured Tetsuko over her as the next heir to the royal family.
The Devil offered her immortality and demon creatures if she sacrificed her soul and freedom for it. Jigoku, seeking power and revenge, accepted the offer with no regrets and became permanently immortal.
Jigoku returned to the village with revenge in her eyes. She released the demon creature, then proceeded to head towards the family’s house.
Jigoku walks up the stairs to their parent’s room with a devilish aura around her. She enters the room and kills both her father and mother while laughing.
Tetsuko tells Wakai of the times when she killed 10 demons, 5 dragons, and 2 centaurs with just her fist.
betrayed, crying, and wanting answers from Jigoku, sets out on an adventure to find the forbidden cave.