TOKYO (AP) — Kiyoshi Kurosawa, the Japanese director known as “the master of horror,” was a bit nervous about how viewers might react to his first samurai film. This image released by Janus Films shows Kiyoshi Kurosawa on the set of "The Samurai and the Prisoner." (Janus Films via AP)It’s turning out to be Kurosawa’s most popular film to date, if its reception in Japan, where it opened earlier this year, is any indication. The story of “The Samurai and the Prisoner” centers around a rivalry between warlords, those familiar Shakespearean plot twists that characterize samurai films. His latest has all the look of an orthodox samurai film, known here as “jidaigeki,” staying true to its legacy of depicting the horrors and pathos of war.