Ooka Echizen is a town magistrate based in Edo, appointed by Shogun Yoshimune in 1717. Often preferring to wander among commoners in disguise, he actively keeps the peace in Edo and helps clear corruption out of local politics. From the second season, Tadasuke concentrates on defending the oppressed in unfair cases, and the third introduces troubles in his personal life, such as his relationship with his son.