In an alternate universe of feudal Japan, a lone warrior must pilot a mechanical suit of Samurai armor to battle against demons (youkai) in the form of mechanical beasts.
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A kappa (河童, lit. river child) is a yōkai found in Japanese folklore.The kappa is typically depicted as roughly humanoid reptilian in form and about the size of a child. A kappa has a beak, a shell, webbed hands and feet and a plate (sara), a flat hairless region on the top of the head that is always wet, and is regarded as the source of the kappa's power.
Uma-shika (馬鹿) is a horse-like monster with a horn on its head and a single bulging eye.
Tengu (天狗, "heavenly dog") are a type of legendary creature found in Japanese folk religion. Although they take their name from a dog-like Chinese demon (Tiangou), the tengu were originally thought to take the forms of birds of prey, and they are traditionally depicted with both human and avian characteristics. Buddhism long held that the tengu were disruptive demons and harbingers of war.
Oni (鬼) are a kind of yōkai from Japanese folklore, variously translated as demons, devils, ogres or trolls.
Depictions of oni vary widely but usually portray them as hideous, gigantic ogre-like creatures with sharp claws, wild hair, and two long horns growing from their heads. They are often depicted wearing tiger-skin loincloths and carrying iron clubs called kanabō (金棒).