The plot basically goes like this: Chronos corporation loses a strange, technologically advanced device, and it accidentally winds up in the hands of an ordinary high-school student, Sho Fukamachi. It turns out the device is a powerful suit of battle armor, which Sho uses to become a superhero called "Guyver". Chronos corporation is not very happy about this (naturally), and throws everything they can (Zoanoids) at Sho to recover the Guyver armor.
The Guyver is a typical superhero tale, packed full of nasty bad guys and a hero with wondrous powers. In the tradition of such flicks, monsters are continuously sent out to defeat the Guyver, only to be utterly crushed. So, naturally, even bigger and stronger monsters are sent out to defeat the Guyver.<br />