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Here's the Wikipedia article on the shrine, lifted from the press release for the movie Yasukuni.
Yasukuni Shrine (靖国神社, Yasukuni Jinja is a
Shinto shrine located in
Chiyoda,
Tokyo,
Japan. It is dedicated to the
kami (spirits) of
soldiers and others who died fighting on behalf of the
Emperor of Japan.
[1] Currently, its
Symbolic Registry of Divinities lists the names of over 2,466,000 enshrined men and women whose lives were dedicated to the service of
Imperial Japan, particularly to those killed in wartime.
[2] It also houses one of the few Japanese War Museums dedicated to World War II. There are also commemorative statues to mothers and animals who sacrificed in the war.
Yasukuni is a shrine to house the actual souls of the dead as kami, or "spirits/souls" as loosely defined in English. It is believed that all negative or evil acts committed are absolved when enshrinement occurs. This activity is strictly a religious matter since the separation of State Shinto and the Japanese Government in 1945.
The priesthood at the shrine has complete religious autonomy to decide to whom and how enshrinement may occur. They believe that enshrinement is permanent and irreversible. According to
Shinto beliefs, by enshrining
kami, Yasukuni Shrine provides a permanent residence for the spirits of those who have fought on behalf of the
emperor. Yasukuni has all enshrined
kami occupying the same single seat. The shrine is dedicated to give peace and rest to all those enshrined there. It was the only place to which the
Emperor of Japan bowed.