Tatsu, a notorious and feared yakuza leader nicknamed "The Immortal Dragon," withdraws from the criminal syndicate and becomes a housekeeper to help his wife, Miku. The series features a variety of comedic settings, typically showing Tatsu's domestic activities and intimidating inequality with his looks, as well as multiple encounters with his former colleagues and rivals in the Japanese Criminal Syndicate.
In Tokyo, an old person, who lived alone, is found dead. Detectives from the Police Station investigate the case. According to the victim's neighbors, a woman sometimes came in and out of the victim's home. That woman is Miki Yamamoto. She does housework for her customers. The detectives from Police Station visit Miki’s house. What is the truth behind the cases?