Hishou, Ginga, Ace, Hayate, and Ikazuchi all work at a studio doing various idol-related jobs at the request of their manager, Reiko. But in reality, These five teenagers are really the Reideens, a group of superheros who fight the Super Devils sent by Lushu, a mysterious being. Little do the Reideens know, these Super Devils are being sent for a more important purpose...
 
(Source: Anime News Network)

After a slumber of 12 millennia, the Demon Empire returns to seize control of the Earth. Reideen, the giant robot-like protector of the lost continent of Mu, senses the evil presence and awakens within its golden pyramid, revealing to young Japanese boy Akira Hibiki that he is the one descendant of the ancient Mu people who must help Reideen save Earth. 
He was assisted by his friends, token girl Mari Sakurano (daughter of a scientist fighting the Demon Empire) and several members of his high school soccer team. 
(Source: AniDB)

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