Reideen - S01

Saiga is an ordinary high school student with a talent for mathematics. His daily life is upended when his family learns that his father's remains have been found. His father, a well-known archeologist and researcher, had disappeared while exploring a site many years earlier. Among the remains were notes and artifacts that the family needed to identify near a famous triangular mountain in Japan known as "Japan's pyramid," a place some believe to be man-made. A meteor carrying a strange robotic lifeform falls from the sky and starts causing destruction, putting Saiga in danger and causing a mysterious bracelet from his father's research to activate and merge him with an ancient robot buried inside the pyramid, a robot the runes call Reideen. Now Saiga and the guardian Reideen must fight this unknown alien threat from the sky.