This story is mainly a spin-off of Armor Hero One, combined with some of the background from Armor Hero Two.
The story takes place twenty years after the Battle of Light and Shadow. The former armor summon users have retired and are living the lives they wanted. Earth's strongest summon user is now the grown-up Xiang Yang, who summons the Emperor Armor. This time, however, their opponent is none other than the supreme emperor of the Shadow Realm: the Shadow Emperor!
