The shogun Mito Mitsukuni crosses Japan in disguise, accompanied by two bodyguards, the master swordsman Suke (Sasashi Sukesumaburo) and the strongman Kaku-san (Atsumi Kakunoshin), the grandson Sutemaru, the dog Dombee and, in part of the series, by a girl named Yuki. Each episode follows a basic plot: the group arrives in a village, with the shogun hiding his identity. While they're resting they happen to witness some mysteries and some wrongdoings done by local personalities, prompting the group to investigate. In the end of every episode Suke and Kaku confront the main evildoer and, after a brawl in which Suke and Kaku show their physical prowess besting the minions of the main perpetator with their abilities (Suke valiantly fighting with his katana, Kaku showing off "the strenght of 100 men" to overcome his enemies), Suke shows the inrō that reveals Mitsukuni identity, ordering the villains to surrender and accept Mitsukuni's judgment, who then explains the mystery as an act of deliberate evil, punishes the wrongdoers and encourages the good people to go on with their lives.