The story is set in an ancient time, when the whole country was covered in thick forests. A mysterious plague breaks out, resulting in countless deaths. A pure young man named Yoshihiko becomes chosen as a hero, and he sets out on a journey in order to save a village. He has two goals – to bring back the legendary plant that can cure the plague, and to rescue his father Teruhiko who left to find the plant but never returned.
A plague grips Kaboi. No one has seen the hero, Teruhiko, since he left to find the cure. Legendary sword in hand, Yoshihiko sets out to replace him.
The village of Marnia ritually sacrifices local girls to the mountain god. Yoshihiko and company decide to visit this god and stop the next sacrifice.
Monster attacks leave the people of Kirana at their wits’ end. Yoshihiko declares that he will defeat the monster responsible for the chaos.
Buddha orders them to collect the items needed to defeat the Demon King. The team sets out to get the first item: the Celestial Maiden’s Feather Robe.
People say no one leaves the village of Oissu alive, but Yoshihiko’s party must head there to obtain the Shoes of Invincibility on Buddha’s orders.
The party encounters a monster while searching for the impact-deflecting Demon’s Helm. Danjo is hit by a confusion spell and wounds Yoshihiko
Radoman agrees to give Yoshihiko’s party the Dragon Shield if they manage to collect rent from his tenants, the residents of a five-story pagoda.
On Buddha’s instructions, the party heads to Akibara to get the Philosopher’s Mail. They happen upon a shrine said to grant visitors a new career.
Yoshihiko and company’s next target is the Ring of Life. When they arrive in the fairy village, they discover that the Devil Priest has stolen it.
Having collected the magic items, the crew heads for the Demon King’s castle across the sea. Buddha says they’ll need a magic carpet to get there.
Yoshihiko and company arrive at the castle town, a vast city far removed from their own world. They decide to split up and search for the castle.