On November 25th 1970, a man committed ritual suicide inside the Tokyo headquarters of the Japanese Ministry of Defence, leaving behind a legacy of masterpieces and a controversy that echoes to this day. The man was Yukio Mishima, one of Japan's greatest and most celebrated novelists. With four members of his own private army - the Tatenokai - Mishima had taken the commandant hostage and called upon the assembled military outside the Ministry to overthrow their society and restore the powers of the Emperor. When the soldiers mocked and jeered Mishima, he cut short his speech and withdrew to the commandant's office where he committed seppuku - the samurai warrior's death - tearing open his belly with a ceremonial knife before being beheaded by one of his colleagues. What was Mishima truly trying to express through his actions? And what did he witness during his final moments?
The film is told in three acts, beginning with a historical background of Japan's student movement of the 1960s and early 1970s, mostly using archive footage and a narrator. The second act follows the formation of the group to their mountain training camps in the southern Japanese Alps. It emphasizes the dogmatic (and eventually hypocritical) bullying of the group by Mori and Nagata, with 12 members being killed for infractions as small as improperly cleaning a gun, wearing make-up, and kissing. The third act shows the splitting up of the group after two members run off. It follows one group of five members to Karuizawa and a hostage-taking and police standoff known as the Asama-Sansō incident.