Mitsuba’s fiancé Kuraba turns out to be a corrupt merchant who sells illegally obtained weapons to the Joi Faction members. Wishing for her sister’s happiness, Okita tries to overlook Kuraba’s crime. But as the Shinsengumi, Hijikata must expose Kuraba. As their mixed emotions build up, the rift between the two widens. In the midst of this turmoil, Mitsuba’s condition takes a sudden turn for the worse after being hospitalized. Okita, Gintoki, and Kondo rush to the hospital, but Hijikata continues to keep a look out for Kuraba.