In January 1904, the situation between Japan and Russia had grown tense. The Emperor Meiji is deeply concerned, for Russia has started to build an invincible fortress at Port Arthur, and the relations between two countries have become strained to breaking point. General Nogi has retired to the first reserve and is now a gentleman farmer, but he is prepared for sudden mobilization. Finally, Japan declares war against Russia and Emperor Meiji appoints General Nogi as the commander of the force to attack Port Arthur. However, in spite of several all-out attacks, the fortress is strong and the casualties increase among the Japanese. Because of these reverses, there are loud cries for a change in command. However, the Emperor places his confidence in General Nogi.

Meiji Tenno portrays the buildup to the Russo-Japan War. In addition to showing the political events that led to war, it also shows the era from the story of a farm family in rural Japan that sends their son off to war. As such, it could be considered an anti-war movie, showing how, while war is devised by governments, the people do not really understand what war is, and its combatants often do not know what they are fighting for.