Hunter in the Dark (1979)

An aging Yakuza boss in the the late 18th century runs a thriving lantern and silk dying business. However, he is also a Hunter in the Dark, an shady underworld figure who unravels a mystery about a rival clan. His wife tries to protect what he wants to throw away. His new bodyguard has a missing memory. The truth lies within the code of the Yakuza, where honor and sacrifice are rewarded with a warriors death.