The series tells the story of the battle between the Earth's defenders and a demonic entity named Genma Daioh. Its first protagonist is Jo Azuma, a Japanese highschool student of the 1970s who suddenly finds out he has psychic powers and is being called along with other psychics around the globe. They are gathered by Vega, an alien cyborg warrior, and Luna, the princess of Transylvania, who have discovered the presence of Genma traveling towards the Earth with the intention to conquer it. In order to stop him, Luna and Vega train Azuma and all the other psychics to defeat Genma and thwart his destructive plans.
(Source: Wikipedia)