A Sengoku romance that dynamically depicts the life of Date Masamune, a Sengoku warlord who was feared as the "One-Eyed Dragon." Bontenmaru, a boy who would later become Date Masamune, was hated by his mother for the smallpox scars on his face, so he tried to cut his right eye with a knife. Bontenmaru hears about the one-eyed dragon from the monk who stopped it, and decides to live as a being that surpasses humans. And Masamune, who succeeded him as head of the family, aims to conquer Oshu in order to take over the country...!?