For three decades, filmmaker Takeshi Kitano was fixated on a period of Japanese history, in which Lord Oda Nobunaga was inexplicably betrayed by one of his closest allies, Akechi Mitsuhide, in an ambush at Honno-ji Temple. The reasons behind Mitsuhide’s deception are unknown, but Kitano dedicated years to concocting his own theories, going so far as to pen a novel imagining the events that led to the incident. Adapted from his own book, “Kubi” is an outrageously exhilarating update of the samurai epic, dialing up the blood and guts and sprinkling in the sick humor to match.