A swordsman with no name (who is named Nanashi despite his no-name status) happens upon Kotaro, an orphan child being hunted by Ming Chinese agents. Nanashi accepts Kotaro’s offer to protect him and his dog Tobimaru in exchange for a treasure once Kotaro arrives at his destination. Meanwhile, the Ming warriors continue to track and pursue them, since Kotaro is needed to realize their agenda.
In a deadly brawl, Fuu meets two fighers – Mugen and Jin – who have incredible skills with the sword. Mugen is an unruly wanderer from Ryukyu who lives by his isntinct rather than his intellect. Jin is a disciplined former student of the Mujuushin school of swordplay, and carries himself with a calm, controlled demeanor. They are polar opposites, but Fuu enlists them to help her find a samurai who smells like sunflowers. Along the way, they get caught up in government intrigue, assassins, bad mushrooms, and everything in between.