Aikoku Sentai Dai-Nippon fight the evil plan of the Red Bear Empire, led by Death Kremlin, to brainwash the children of Japan by replacing the pages of their textbooks with red paper.

The mythical eight-headed serpent Orochi was created by aliens, which invaded Earth in ancient times. 2000 years later, they dispatch the Orochi again to destroy Japan and the rest of the world. Only a team of the Japan Self-Defense Forces and a scientist can destroy it.