Zettai Muteki Raijin-Oh

The Jaaku Empire (literally "Evil Empire") targets Earth to be conquered. From their fortress they launch a missile attempting to flood the world with Akudamas, balls of darkness which materializes the words of humans which bring them troubles into monsters known as Jaaku juu(Evil beasts). However the guardian of light Eldoran appears, piloting Raijin-Oh to attempt to thwart them. In response, the missile is detonated prematurely. Thus scattering its payload and sending Raijin-Oh down to crash into a school. There, Eldoran protects the 4th grade class whose classroom it was about to fall into, and grants each of them medals which grant them control over different aspects of Raijin-Oh. He reconfigures the school so their classroom becomes a command center when activated, and charges them with the task of protecting the Earth.