Ghost story of devil's fire swamp (1963)

Nishina Saburouta is powerful but corrupted priest. One night, an old samurai who couldn't bear him any more, attempts to kill him, but without success. Saburouta is rescued by his niece, Keisuke at the last moment. Keisuke is a a good-for-nothing. Since that event, he always turns to his uncle when he needs money. Recently Keisuke feels his uncle isn't as generous as he used to be, he suspects that Saburouta has found out the illicit relation between Keisuke and his uncle's young mistress, Ohasu.