Isshin Tasuke, a friend of Ōkubo Hikozōemon, the esteemed public arbitrator of the realm, saved the maid Onatsu from punishment after she accidentally broke a plate gifted by Lord Ieyasu. Tired of the strict samurai service, Tasuke moved to the Genbei tenements and opened a fish shop. This tenement housed various characters, including the landlord's daughter Osen who had a crush on Tasuke, the midwife Okan, the blind masseur Oyone and her husband, the carpenter-loving couple Yoshigorō and Ohama, the rōnin Takeuchi Yogoemon, and the siblings Ochika and Shin'nosuke who cared for their sick mother.