Long ago, the malevolent emperor Talpa sought to dominate the Earth but was vanquished and exiled to the Nether Realm, his armor split into 9 distinct suits. Now, with 4 suits back in his grasp, Talpa plots Earth's subjugation once more. Standing in his way are the Ronin Warriors, guardians entrusted with the remaining 5 suits, the planet's sole defenders against his resurgence.