Yuki Cosmo pilots three ancient mechas to defend Earth from the invading Buff Clan. Following the destruction of Solo, this alien race has descended upon the planet in search of a legendary energy source known as Ide. When the pressure of the invasion becomes too great, Yuki merges his machines into a single colossal robot called Ideon. This massive unit serves as humanity's primary defense against the extraterrestrial forces attempting to seize Earth's remaining resources.
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