OVERMAN King Gainer is a tV series anime that premiered in fall 2002, produced by Sunrise.

About the production: the story comes from an original script, there are 26 episodes of about 25 minutes and its current status is "finished".

Its main genres are action, adventure, mecha and sci-fi, with themes such as Politics, Super Power, Post-Apocalyptic and Real Robot.

On AniList, OVERMAN King Gainer has an average score of 70%, a good score, and appears on 6,579 users' lists.

In the distant future, mankind is forced to live in domed cities called Domepolis after an environmental cataclysm. These cities are maintained and supplied by private corporations, but at what cost to the inhabitants living within them? In a Siberian Domepolis, virtual game champion Gainer Sanga is arrested on suspicion of Exodus, an unauthorized venture beyond the dome walls and strictly prohibited by the government. In prison, he meets Gain Bijou, a mercenary bent on escaping and together the two will steal a mysterious Overman out of Duke Medaiyu's mansion. Fighting back the Siberian Railway Patrol forces, they both lead a massive Exodus out of the city to the east land Yapan, where their ancestors are originally from. (Source: Bandai Entertainment)

Official synopsis from AniList.