13 Assassins (2011)

In Feudal Japan the era of the samurai is waning. The sadistic young Lord Naritsugu rapes and kills at will. No one can touch him because he is the former Shogun's son and current Shogun's younger brother and thus above the law. A senior government official realizes the situation will become more dangerous after Naritsugu ascends to a higher political position. After a wronged party publicly commits seppuku, a trusted older samurai, Shinzaemon, is secretly hired to assassinate Naritsugu.