After losing his parents he yearns to become a Knight the poor boy Wynn Byrd diligently trained himself. However it was hopeless for him to become a Knight because his magical power was too low he can’t pass the Knight examination so he was labeled with the unpleasant title of 『Eternal Knight Cadet』. But one day the Brave defeated the Demon King and saved the world. The Brave was a peerless beauty and she gained attention from the entire world. However the Brave declared to the world. 「I will return to my Master’s (Teacher) side Wynn Byrd.」 This is the story about a boy who somehow changed his class from 『Eternal Knight Cadet』 to 『Brave’s Master』.