After defeating the legendary beast Totetsu in Papura, Kai arrives in the city of Balse and fulfills his dream of registering as an adventurer. One day, Anna, a knight serving the princess, gets into trouble with a slave trader and urgently needs a large sum of money. As a result, Kai enters the Sacred Martial Arts Tournament. However, during the tournament, a major incident occurs that shakes the nation! Meanwhile, Kai's childhood friend Keith and his group, who were in the royal capital, are attacked on their way to Balse, leading to the kidnapping of Rena!