A sudden “dimensional fusion event” causes Earth to crash together with the Kamen Rider universe and the Armor Hero universe, officially ushering in the “Symbiotic Era.” The red flash of Kamen Rider Kuuga’s battles streaks across the streets, while the summoning sound of Armor Hero Flame Dragon echoes over the city. The two sides join forces to fight the “Chaos Forces” born of the dimensional fusion and classic villains from their respective universes, including the remnants of the Shadow Emperor’s forces and the Shocker organization. Yet their differences in ideology, the Riders believe in “breaking through by individual will,” while the Armor Heroes uphold “the bonds and duty of the team”, leave tensions simmering beneath the surface.
Twenty-year-old college student Lin Chen is a fan of both Kamen Rider and Armor Hero. After waking from a nap, however, the dimensional energy activates his family’s heirloom pendant, a “Light and Shadow Crystal,” and he unexpectedly becomes the sole summoner of the ultimate force in the Armor Hero series: Emperor Armor. Faced with this sudden, ultimate power, he goes from confusion and losing control, while both sides doubt him, to gradually learning to master it. In battle after battle, he finds a way to reconcile the Riders’ and Armor Heroes’ conflicting ideals: he learns from Kamen Rider Kuuga’s determination to “protect people’s smiles,” understands the weight of “team bonds” alongside Flame Dragon Hero Xin Nan, and uses Emperor Armor’s power of light and shadow to break down the barriers between the factions.
From his first awakening, when he drives back the low-level Chaos Beast known as the Shadow-Eater, to venturing deep into dimensional rifts to uncover the truth behind the fusion event; from joining forces to foil the schemes of an ambitious insider to establishing the “Symbiotic Guardians Alliance” and creating a defense line across the factions; in the end, he faces the ultimate threat of the Shadow Emperor, the Shocker leader, and the “Dimensional Devourer,” relying on “faith
