The battle for the Capital city of Kyo rages as warring political factions vie for power against hereditary rulers. After the murder of her parents at the hands of her seditious uncle, a young girl names Kintoko flees to the mountains to lead a harsh life; she is renamed Kai Doh Maru by the local villagers. Rescued by Raiko, the Captain of 'The Four Knights' - honorable defenders who protect the peace of the city - she is raised within their group as a boy...