New Century Legend Mars - S01

While covering a newly formed volcanic island, journalist Iwakura finds a stranded young man with no memories. News of this reaches a mysterious figure named Rush, who tracks down the amnesiac and tells him the truth about who he is. The young man is Mars, and like Rush, he is not from Earth. Mars was sent with one mission: to pilot a hugely powerful robot called Gaia and destroy Earth once humans begin trying to expand into outer space. As a safeguard, Gaia is built to self-destruct and take the planet with it if Mars dies. Because Mars has amnesia, Rush gives him 10 days to study Earth's history and decide what to do. Mars must now choose whether to carry out his duty or fight to save humanity.