The shadowy leader of the Vipers of Heaven its revealed: Cobra Commander!
...or rather, it's Satan! A mysterious masked man with his compatriots Silene, Kaimu and Akira amon (deja vu, anyone? Nagai sure loves Devilman callbacks). There's a sudden attack on Heaven, Inc's power base and Chikara and Aoi are thrust into a deadly situation while the Vipers make their play.