A historic figure Tokugawa Mitsukuni, former vice-shogun and retired daimyo of the Mito domain travels through Japan in the guise of Mitsuemon, a retired crêpe merchant from Echigo province, accompanied by his two samurai retainers, fun-loving Sasaki Sukesaburō (Suke-san) and studious Atsumi Kakunoshin (Kaku-san).