The 47 Ronins of Ako (1979)

Set in the eighteenth century, during the reign of the fifth Tokugawa shōgun Tokugawa Tsunayoshi. Akō-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 of the Uesugi clan. The Uesugi clan and Chisaka are wary of Ōishi Kuranosuke and Ako Roshi's movements, so Chisaka orders Hotta to observe Ōishi Kuranosuke.