One fateful night, high schooler Sho Fukamachi stumbles upon a strange metallic device, unwittingly merging with the powerful Guyver in a dazzling burst of light. As he grapples with this newfound identity, Sho must protect his girlfriend, Mizuki Segawa, and thwart the sinister ambitions of the Chronos Corporation. With the aid of the Guyver, a formidable alien mecha, Sho battles the malevolent Zoanoids, bioengineered creatures created by Chronos, in a bid to safeguard not just his loved ones but the fate of the entire planet.