Sleepy Eyes of Death 3: Full Circle Killing (1964)

A decapitation at the hands of the shogun's monstrous misbegotten son kicks off the action and draws nomadic Nemuri Kyoshiro (Raizô Ichikawa) into more sword-fighting adventures when he's blamed for the beheading. Meanwhile, the head-chopper's mother is busy knocking off the shogun's lawful heirs to secure the shogunate for her son.