From the introduction: 300 years ago the Space Shogunate Jark Matter ruled the universe. A rebellion formed, led by Tsurugi Ohtori the immortal Houhou Soldier and first earthling to travel outside of our solar system and his allies Orion and Quervo They along with many others become the 88 original Kyurangers. They were eventually victorious at overthrowing Don Armage, the leader of Jark MAtter, but at great cost. Most of the 88 soldiers lay dead and Tsurugi himself was forced to channel his immortality into a final desperate attack.