Modern young man Adam unexpectedly transmigrates into Emberstone Valley, a place ruled by female warriors. As soon as he lands, he nearly gets executed for extinguishing the tribe's sacred flame. In this world where women are responsible for fighting and men perform bottom-tier labor, Adam, who is not good at combat, can only rely on modern knowledge to survive. Using methods such as making fire, purifying water, cooking food, sanitation, nursing, and storing grain, he resolves one tribal crisis after another, and gradually earns the trust of the female leader Eve and the tribespeople. At the same time, he discovers that the four red sunstones separated from him during the transmigration may be the key to returning to the modern world.
Adam's reforms continuously shake the rule that High Priestess Selene maintains through "oracles," and ultimately expose her secrets of hiding grain, manipulating the tribespeople, and causing Eve's mother's death. After Selene's downfall, the even more powerful Valen Kingdom demands grain and laborers from the Emberstone tribe. Facing the threat of annihilation, Adam and Eve lead the tribespeople to smelt iron, make composite bows, and improve their defenses, defeating the vast Valen army with the weak overcoming the strong.
