The protagonist, Ryu, born into the Baronial House of Ardren, is unable to use magic from an early age due to "a certain reason." Branded as incompetent by his father, he is driven away to a separate villa along with his mother and his younger sister, Rena. While living a modest but happy life, misfortune strikes as his mother falls seriously ill. Upon learning of this, the father, who had always viewed them as a nuisance, plots an assassination to eliminate the three of them. Discovering the plot, Ryu makes a firm decision. To protect the lives of his mother and sister, he will overthrow his father, and to afford his mother's medicine, he will develop the territory he seizes into the best land possible—! The curtain rises on the strongest heroic territory management fantasy of a noble once despised as incompetent!