Sleepy Eyes of Death 11: In the Spider's Lair (1968)

The "tarantula" in question is a deadly woman who, alongside her infatuated brother, commits heinous acts without remorse, believing their wealth places them beyond the reach of justice. Kyoshiro, a wandering samurai without a master or a home, has little to lose and no moral qualms, allowing him to confront even the most powerful figures without fear. Although he possesses his own dark tendencies, he inadvertently becomes a protector of the oppressed, standing against the tyranny of the affluent.