On Earth, Guren receives Gen's advice about "choosing the side he wants". Meanwhile, the Corekai decide to infiltrate into the Dark Fortress to find the last Dragon Cube. But Dromus is equipped with a Core Corrupter to make the Corekai evil. Remebering Gen's advice, the Knights are able to turn their allies back to their old selves, causing Dromus to retreat. The heroes finally get all Dragon Cubes. Back on Earth, Guren's computer recives a meesage telling he is one of the "keys" that awake the Tenkai Dragon.
