Demons (1971)

"This world is a sea of blood."

Gengobe Satsuma, an exiled samurai cast out as an Asano clan retainer, is given a second chance to join his brothers in arms to become the 48th Ronin against the Shogunate. His faithful servant gathers the 100 ryo required for his acceptance. Gengobe is also in love with a greedy geisha named Koman. About to be sold to another man, Gengobe learns that in order to keep her, her debt is exactly 100 ryo.