A former overworked office worker is reborn as Noct, the second son of the weak Big Small family. His territory is constantly impoverished due to monsters attacking from the Great Forest. When he comes of age, he receives the skill [Enlarge & Reduce], which seems useless at first. After the death of his brother and the lord, he inherits the territory, but the people flee. Despite the dire situation, Noct's skill is anything but useless. He enlarges crops to improve food security, enhances his companions' skills, and creates a massive defensive wall using Earth Shield. Realizing his skill's versatility, he transforms his weak territory into the strongest.