Men Behind the Sun

The film is a graphic depiction of the war atrocities committed by the Empire of Japan at Unit 731, the secret biological weapons experimentation unit of the Imperial Japanese Army during the Second Sino-Japanese War. It details the various cruel medical experiments Unit 731 conducted on Chinese and ethnic Russian prisoners towards the end of the war.

Summarize Fact Check

An opening caption reads, "Friendship is friendship; history is history."

A group of Japanese boys are conscripted into the Youth Corps. They are assigned to the Kwantung Army, and are brought to one of the facilities serving Unit 731, which is headed by Shirō Ishii. Soon, they are introduced to the experiments going on at the facility, for which they feel revulsion. The purpose of the experiments is to find a highly contagious strain of bubonic plague, to be used as a last-ditch weapon against the Chinese population.

The young soldiers befriend a local mute Chinese boy with whom they play games of catch. One day, the commanding officers ask the boys to bring the Chinese child to the facility. Naively, they follow orders believing that no real harm will come to the boy; however, the senior medical staff vivisects the boy and keeps his organs for research. When the young soldiers realize what has happened, they stage a minor uprising by ganging up and physically beating their commanding officer.

After a revelation, Dr. Ishii develops a prototype ceramic bomb that does not kill the infectious fleas inside upon being launched. To test its efficacy, he orders several Chinese prisoners to be tied to crosses. However, the experiment is botched since the Japanese aerial forces are retreating. Chinese prisoners break free from the crosses, and attempt to escape; however, Japanese troops hunt them down, and nearly all of them are run over or shot, including several Japanese.

Unit 731 hears of the atomic bombings of Hiroshima and Nagasaki and Russia's declaration of war. Dr. Ishii orders his subordinates and their families to kill themselves, but is persuaded instead to evacuate them and only commit suicide if captured. Afterwards, Unit 731 destroys evidence of their research, including gassing the surviving test subjects to death and blowing up the facilities.

That night, the Japanese troops and their families wait at the train station before their return to Japan. The lone survivor of Unit 731, disguised as a Japanese soldier, makes an attack but is impaled by a Japanese flag. The Youth Corps clutch onto the blood-stained flag in horror as they depart the station.

The closing passages relate that Dr. Ishii cooperated with the Americans, giving them his research and agreeing to work for them. Years later, he is moved to the Korean War, and biological weapons appear on the battlefield shortly thereafter. The Youth Corps involved with 731 are revealed to have led hard lives after the war, with their educational background being stigmatized.

Though Mou claims he was trying to depict historical events with accuracy,^[1][2] he has been criticized by Hong Kong-base writers who had said the movie's exploitation film presentation negates any educational value involving a historical atrocity, and Japanese critics deemed the film as anti-Japanese propaganda. American horror film critics have called the film horrifying, but lacking in terms of writing technique such as narrative structure, while agreeing with Hong Kong critics regarding its lack of educational value. The film has had no official US release, even after an English dub was created for International release.^[3]

Owing to its graphic content, and use of actual corpses and human body parts, an international release proved to be difficult. The film faced difficulties with censors worldwide. It was banned in Australia^[4] and caused a public outcry in Japan to the extent that director Mou received death threats.^[2][5] The film was given several minutes of mandated cuts to be allowed a release in the United Kingdom.^[6]

The film garnered further controversy for its use of what Mou claims was actual autopsy footage of a young boy and for a scene in which a cat appears to be eaten alive by a horde of rats. Eventually it was proven that the cat was not harmed, only covered in honey which the rats licked off.^[7]

From contemporary reviews, "Lor." of Variety declared the film to be a "lowbrow exploitationer treating a serious subject, Japanese war atrocities", noting, "Explosive material is dramatically potent and could have been handled tastefully, as with Kon Ichikawa's classic films like Fires on the Plain" but Mou instead "resorts to nauseating sensationalism, with butcher-shop depiction of autopsies on live subjects, a disgusting 'decompression' experiment spewing intestines out of a victim and a horrendously realistic scene of a pussycat bloodily mauled by a room full of rats".^[8]

• Unit 731: Laboratory of the Devil [zh] (黑太陽731續集之殺人工廠, 1992)
• Unit 731: A Narrow Escape [zh] (黑太陽731完結篇, 1994)
• Black Sun: The Nanking Massacre (黑太陽─南京大屠殺, 1995)

• Philosophy of a Knife
• Unit 731