Set in the eighteenth century, during the reign of the fifth Tokugawa shogun Tokugawa Tsunayoshi. Ako-han is demolished by the Tokugawa shogunate. Hotta Hayato is a ronin who is living a desperate life because of his sad past. But one day, he starts working for Chisaka Takafusa, the Chief retainer (Karo) of the Uesugi clan. The Uesugi clan and Chisaka are wary of Oishi Kuranosuke and Ako Roshi's movements, so Chisaka orders Hotta to observe Oishi Kuranosuke. But Hotta gradually comes to like Oishi's personality and even helps Oishi. (Source: Wikipedia) ~~ Adapted from the novel "Akoroshi" (赤穂浪士) by Osaragi Jiro (大佛次郎).