In the not-too-distant future, Japan is under siege by strange mechanical monsters led by a sinister ex-hero named Eko. Though the future looks bleak, all is not lost. There is a young hero chosen by the Landlord Yuri to fight against the phantoms that plague Japan. He is KARAS, a powerful armored being appointed to defend the innocent. With the help of Yuri, his mystical mentor, Karas sets out to preserve the natural balance of the universe, and to prevent the friendly old-world monsters from being transformed into mechanical demons!