Raidorl Seiken Senki

Raidorl Zain was born and raised as the second prince of the Kingdom of Zain. He lived a peaceful life surrounded by his kind elder brother and loyal vassals, however, his fate completely changed drastically during his coming-of-age ceremony when he was chosen to be the holder of "Dáinsleif," the excalibur (sacred sword) of the royal house. His brother, the first prince, started to hate him as an enemy that threatened his claim to the throne, his vassals and even his own fiancée abandoned him, and he was banished to a town in development at the borders alone. Since then, Raidorl has struggled to survive at the borders that were a monster's domain, gaining the trust of those around him, he found a new happiness with his friends in that poor and harsh life.

However... his fate change once again when the neighboring Arsline Empire started to invade the Kingdom of Zain. Forced by his brother to fight to protect the kingdom from the Empire's invasion, Raidorl decides to plot a rebellion against the overly selfish demands of all those people that banished him. When the exiled prince takes the sacred sword on his hand, the curtains of a new heroic legend will open!

(Source: Shousetsuka ni Narou, translated)