Reideen - S01

Saiga is an ordinary high school student with a talent for math. His quiet life is upended when his family learns that his father’s remains-along with his research notes and artifacts-have been found near a mysterious triangular mountain in Japan, often called "Japan’s pyramid." His father, a well-known archaeologist, had vanished years earlier while investigating the site. Before Saiga can process the news, a meteor crashes to Earth, unleashing a hostile robotic creature that wreaks havoc. In the chaos, a bracelet from his father’s research activates, fusing Saiga with an ancient robot buried within the pyramid-an entity the ruins call Reideen. Now, Saiga must work with Reideen to defend against the alien threat descending from the sky.