Set in the Edo period, Hissatsu Urakagyou follows Kyōjirō Tatewaki, a respected young doctor beloved by the townspeople of Edo. However, beneath his kind and gentle persona lies a deadly secret—he is an assassin of the underworld, delivering justice where the law has failed. By day, he saves lives; by night, he takes them. Under the guidance of his adoptive father, Dōjun, and alongside his fellow assassins, Kyōjirō navigates the dangerous line between healer and executioner. As corruption and crime grip the city, he must face formidable foes, uncover hidden conspiracies, and confront the moral dilemmas of his double life. Will he remain the people’s savior, or will the darkness of his work consume him?

Set in the Edo period, Hissatsu Urakagyou follows Kyōjirō Tatewaki, a respected young doctor beloved by the townspeople of Edo. However, beneath his kind and gentle persona lies a deadly secret—he is an assassin of the underworld, delivering justice where the law has failed. By day, he saves lives; by night, he takes them. Under the guidance of his adoptive father, Dōjun, and alongside his fellow assassins, Kyōjirō navigates the dangerous line between healer and executioner. As corruption and crime grip the city, he must face formidable foes, uncover hidden conspiracies, and confront the moral dilemmas of his double life. Will he remain the people’s savior, or will the darkness of his work consume him?