In a parallel world populated exclusively by women, no male children are ever born. The only way for the kingdom to secure a successor is to summon men from other dimensions through magic. Taiga Shishido is one such man, pulled into this realm at the moment of his death in his original world. Upon arrival, he is given a singular, high-stakes mission: to choose a single bride from a pool of eighteen candidates. These women come from all walks of life, different social classes, professions, and even races, and the one he selects will make him the future king of the realm. The narrative follows the battle royal of courtship as these eighteen prospective brides compete for Taiga's hand, forcing him to navigate complex political schemes, cultural clashes, and the personal desires of each contestant. Notable narrative arcs include the initial summoning and introduction of the eighteen diverse marriage candidates, followed by various trials and competitions designed to test their compatibility and eliminate contenders. These events explore the unique tensions of a society lacking men, where an outsider’s choice will determine the future of an entire world.