Tekkoryu (Hau Dragon) - a secret Chinese-based organization bent on world domination. After the rise of their new leader, Yuratei, the Tekkoryu come out of hiding and unleash the Hakkeshu - a band of giant robots with lethal weaponry and equally skilled pilots. Before their quest for domination, the Hakkeshu must recover one of their own mecha - Zeorymer of the Heavens, stolen from them 15 years ago by a turncoat member along with the frozen embryo of a genetically engineered pilot. Caught in the crossfire is Masato Akitsu, a teenager captured by a Japanese organization and forced to pilot Zeorymer. Teamed with a mysterious girl named Miku Himuro, Masato must use Zeorymer to battle each of the Hakkeshu's mecha; at the same time, he must figure out why he was chosen to pilot the mecha and why he is able to adapt to it so easily.