A man who was a former Shachiku was reincarnated as Lux, the Seventh Prince of an empire who was abandoned by his father, the Emperor, due to his lack of magic power and was called the "Incompetent Prince." Realizing his position of being treated coldly even by the Imperial Family, he decides to begin training to acquire magic power in order to protect himself and his precious mother, Sonya, from the succession struggle unfolding among the princes――. The underdog Fantasy of a coldly treated, incompetent prince begins!