In the year 1355, the demon king Elslow was defeated thanks to the efforts of the twelve heroes of the mainland, and the first hero Arlo disappeared. Three years later, Regus, the fourth hero of Arlo's friends, suddenly learned that Arlo might still be in the world, so he embarked on a journey to find the first hero with the elf sage Crow. However, the truth behind Arlo's disappearance and the defeat of the Demon King are not that simple. Regus is gradually involved in a huge danger that transcends countries.
