Bakeneko: a vengeful spirit (1968)

Nabeshima Naoshige murders his lord, Ryuzoji Takafusa, seeking to gain power and steal his Lord’s wife. To avoid her fate, Lady Takafusa drowns herself along with her cat in a nearby marsh. A decade later, Naoshige’s efforts to steal another woman trigger a curse on him when she also commits suicide at the same marsh — forcing him to suffer the consequences of his past actions.