Nezu no Hamakichi used to be a renowned detective. He had lost his job and been banished from Edo after he was arrested for some reasons. Back in Edo for the first time in 5 years, he has just sold toys. This is a story that Hamakichi resolves difficult incidents.

Hamakichi, who used to be a detective is now a toy merchant. His former boss has a grudge against the Yakuza family, which leads to the murder of a policeman in Edo. This places Hamakichi between the rock and a hard place.

Hamakichi was a former detective respected by everyone but he was arrested after he helped a criminal flee for money, which he needed for his child’s medical treatment. Five years later, he is allowed to enter Edo with a fresh start. He make ends meet by selling toys. One day, he meets Otoki, a woman who is a lookalike of his late wife and who is being pursued by a mysterious man.