Having depleted their home planet's primary resources, the Garadain Empire launches various space expeditions to locate a new world for habitation. Planet Earth stands as one of their primary targets. However, Zeku Alba, an alien scientist, chooses to rebel against imperial authority and flees to Earth. There, he assembles a group of youths gifted with "psychogenesis," the ability to create solid matter from mental energy. The most talented member of this group is Isamu, a young orphan whose family was killed during the Garadain Empire's first attack. He can generate Govarian, a powerful robot armor that allows him to fight alien monsters and regenerate using the pilot's psychic energy. Assisted by two other robots created by his teammates, Isamu pilots Govarian to defend Earth in the prolonged war against the alien invaders.