Dragoon: Ryuu Kishi e no Michi

Rudel Arses, the first born of one of the 'Three Lords' of the Courtois Kingdom, is from a corrupted family, but when he was 5-year-old, he saw a dragon in the sky and his dark future as a villain changed. He was considered an idiot, but was that true? How would his effort to become a dragoon change the kingdom?