Based on the popular manga, Raidoul's Holy Sword Chronicle follows the story of Raidoul Sein, the second prince of the Sein Kingdom. Living a peaceful life surrounded by his kind brother and loyal retainers, his fate takes a drastic turn when he is chosen by the kingdom's holy sword, Dainsleif, during his coming-of-age ceremony. Betrayed and cast out as a threat to his brother's claim to the throne, Raidoul is banished to a frontier city. He struggles to survive in this monster-infested land, earning the trust of those around him and finding happiness amongst his new companions. However, when the neighboring Arsline Empire invades, Raidoul is forced to fight for his kingdom. Confronted with the selfish demands of those who betrayed him, he chooses rebellion. This is the story of a banished prince, a holy sword, and a new legend of defiance.