Samurai Banners

In 1535, Obayashi Kansuke, a masterless samurai, is on his way home to succeed his adoptive father after 15 years of journey studying military strategies. At a deserted village he drops in at, he saves a girl from a samurai. The samurai is one of the soldiers under Takeda Nobutora, the warlord of Kai, who are in the battle with the Imagawa clan of Suruga. The girl named Mitsu falls in love with Kansuke. Meanwhile, the Hojo family of Sagami invades the domain of Kai. Kansuke goes to watch the battle between the Takeda and Hojo armies. Though Kansuke has stopped her, Mitsu follows him and is caught by the soldier of the Takeda clan again.

Kansuke returns home in Mikawa Domain after 15 years. He brings the decapitated head of the samurai of the Takeda army he killed to save Mitsu—he have planned to show it as a display of his prowess in order to be taken into the service of the Imagawa clan. Coming back, Kansuke finds that his adoptive father now has a natural son. The father who wants the son, not Kansuke, to succeed him steals the head and tenders it to one of the warlords under the Imagawa clan as the son’s achievement. Kansuke decides to rename himself Yamamoto Kansuke, the family name of his real parents, and leaves Mikawa for Suruga, where his was born. In Suruga, Kansuke happens to know his elder brother Sadahisa is involved in a conspiracy against the head of the Imagawa family. For knowing the secret, Kansuke is attacked by a group of assassins directed by Sadahisa. Kansuke has to leave home again.

Kansuke goes back to the Kai domain, where he meets Mitsu. She is expecting a baby, whose father, she insists, is Kansuke. Though he refuses her once, Kansuke gradually becomes attached to the unaffected nature of the villagers and eventually makes up his mind to live there with Mitsu and the baby she is carrying. Meanwhile, the ruler Nobutora and his young son and heir Harunobu are on bad term. Nobutora wages wars one after another, provoking complaints against him among his retainers as well as common people. One day, Nobutora goes hunting to get nothing. Irritated, he shoots an arrow at a human—the woman aimed at is Mitsu.