The premise involves five teenage boys recruited by an alien policeman to prevent the destruction of Earth by inmates let loose from an intergalactic prison. Using transformation items, these teenagers can transform into "Dagwon," a team of sentai-like action heroes who can "combine" with their vehicles to attain humanoid robot form, similar to the "Headmaster Juniors" and the "Godmasters" ("Powermasters" in other countries) in "". Though the "card" robots helping Shadow Rei are presumed to have some sort of basic AI, no human-robot relationship seems to exist in this show at all. Instead, it plays with the idea of the boys "becoming" the robots through a sort of mystic fusion, a theme later explored in an incredibly similar Sunrise series by Dagwon's creative team, called "Chouja Reideen". Although nominally a re-imagining of Sunrise and Tohokushinsha's "Brave Raideen", which was developed by staff that would later be members of Sunrise, Chouja Reideen resembles Dagwon far more so than the original Brave Reideen.