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)

In the distant future, in a distant corner of Siberia, people live in domed cities called Domepolises. These are the primary human living spaces on Earth, which became uninhabitable years ago from environmental destruction. Now, parts of the Earth are becoming habitable again. Large portions of the Domepolises are breaking off to escape the powers that control the domes and trade. 
 
Gainer Sanga, video game champ on his 200th victory, becomes an unwilling helper in his hometown's Exodus when he is wrongfully arrested by the Siberian Railway. He pilots a giant mecha which he dubs 'King Gainer' after his own video game handle. He is challenged to fight other Overmen as Yapan tries to escape across Siberia.

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