"Benkei and Ushiwaka" is a historical anime series that draws from Japanese folklore and the legendary tales of the Heian period. The narrative centers on the relationship between two iconic figures: the young warrior Ushiwaka, later known as Minamoto no Yoshitsune, and the towering monk-warrior Benkei. Ushiwaka, a prodigious swordsman and strategist, is depicted as a determined and ambitious youth driven by a desire to restore his family's honor after their downfall. Benkei, initially introduced as a fearsome bandit, undergoes a transformation after a fateful encounter with Ushiwaka, leading him to pledge his loyalty as a retainer.

The story begins with Ushiwaka training under the tengu, mythical creatures who teach him advanced combat techniques and strategy. His journey intertwines with Benkei's when the monk challenges Ushiwaka to a duel on the Gojo Bridge in Kyoto. Ushiwaka's agility and skill outmatch Benkei's brute strength, resulting in Benkei's defeat and subsequent decision to serve Ushiwaka. This partnership becomes the foundation of their shared quest to overthrow the Taira clan, who had seized power and oppressed the Minamoto family.

As the narrative progresses, the series explores their battles, alliances, and the political intrigue of the era. Ushiwaka's rise as a military leader is marked by his innovative tactics and unwavering resolve, while Benkei's loyalty and strength provide a steadfast counterbalance. The series delves into themes of honor, loyalty, and the complexities of feudal Japan, portraying the challenges faced by its protagonists as they navigate a world of shifting allegiances and moral dilemmas.

The climax of the story revolves around their efforts to confront the Taira clan, culminating in pivotal battles that shape the course of history. The relationship between Ushiwaka and Benkei is central to the narrative, highlighting their mutual respect and the sacrifices they make for their cause. The series concludes with a reflection on their legacy, emphasizing their enduring impact on Japanese history and folklore. Through its portrayal of these legendary figures, "Benkei and Ushiwaka" offers a compelling exploration of loyalty, ambition, and the enduring spirit of the Heian period.