"Ōzumō Reijō" centers on the life of Hiyori Takanashi, a young woman who inherits her late father's sumo stable, the Takanashi Stable. Despite her lack of experience in the male-dominated world of sumo wrestling, Hiyori is determined to preserve her father’s legacy and ensure the stable’s survival. The narrative explores her journey as she navigates the challenges of managing the stable, training its wrestlers, and confronting societal expectations that question her role in a traditionally masculine sport.

Hiyori’s efforts are complicated by the stable’s financial struggles and the skepticism of the sumo community. She faces resistance from both within and outside the stable, as many doubt her ability to lead. However, her unwavering resolve and deep respect for sumo’s traditions gradually earn her the respect of her wrestlers and peers. Key characters include the stable’s top wrestler, Shōta, who initially questions Hiyori’s leadership but later becomes one of her strongest supporters, and other wrestlers who each bring their own struggles and aspirations to the story.

The manga delves into the intricacies of sumo culture, highlighting the physical and mental demands of the sport, as well as the rituals and traditions that define it. Hiyori’s growth as a leader is paralleled by the development of the wrestlers under her care, creating a dynamic interplay between personal and professional challenges. Themes of perseverance, gender roles, and the preservation of tradition are woven throughout the narrative, offering a nuanced portrayal of the sumo world. The story balances moments of intense competition with quieter, introspective scenes, providing a comprehensive look at the lives of those dedicated to the sport.