During a tumultuous period in 12th century Japan, a rebellion breaks out in Kyoto, leading to chaos within the royal palace. A loyal samurai named Moritoh Endo risks his life to help the nobles escape and is enamored by the beauty and bravery of Lady Kesa, who volunteers to act as a decoy to ensure the empress's safety. In gratitude for his heroic efforts, Moritoh is granted any wish by the ruling shogun, and he boldly requests Lady Kesa's hand in marriage, unaware that she is already married to another samurai, Wataru Watanabe.

Despite learning of her marital status, Moritoh remains relentless in his pursuit of Lady Kesa, convinced that their destinies are intertwined. His unyielding desire and obsession lead him to devise a relentless plan to win her over, regardless of the obstacles. Torn between honor, duty, and personal desire, Moritoh's actions spur a series of events that test the boundaries of love, loyalty, and sacrifice. The tension escalates as Lady Kesa and Wataru must navigate the dangerous consequences of Moritoh's determination, leading to an inevitable and tragic climax that questions the true meaning of honor and devotion.