Hades Project Zeorymer

Akitsu Masato is a young man unaware of his true identity. Captured by the secret government project "Last Guardian", he learns his life as a normal student was fabricated and that he's destined to pilot the powerful robot Zeorymer of the Heavens. However, this revelation is confirmed by the discovery that his parents have been receiving payments from the government, suggesting they were involved in raising him. Masato soon finds himself at the forefront of a battle against Hau Dragon, a organization from 15 years ago that had created eight massive robots, each representing a force of nature, but was thwarted by their creator, Kihara Masaki, who destroyed seven of them, leaving only Zeorymer intact.