Although mathematically gifted, Junki Saiga is an otherwise typical high school student, whose archaeologist father disappeared during an expedition years ago. But recently his family learned that his father's remains have been discovered near Japan's pyramid along with artifacts and notes from his research. While Junki is still reeling from the confirmation of his father's death, a meteor comes crashing from the sky carrying a foreign robotic life-form that immediately begins attacking anything and everything!
This sequence of strange events triggers a bracelet left from his father's research to activate and merge with an ancient robot hidden inside the pyramid - Reideen. But not everyone welcomes Reideen's help in dealing with the alien threat. There are those that want the robot's power for themselves, and others who want to see it and its pilot destroyed. Without the help of his nation or even his friends, Junki must push himself to succeed in piloting Reideen against the aliens or watch the world perish!
Contains episodes 1-13.
Spoken Languages: Japanese, English subtitles.