In the futuristic world of 2100, interconnected by a vast computer network, children transform their minds into data as Web Divers and frolic in the digital realm of Magical Gate. A sinister computer virus emerges, threatening to unravel this cyber paradise from within. To safeguard the young denizens, specialized programs known as Web Knights are deployed, only to be corrupted by the virus, turning them against their charges. Amidst this chaos, a lone uncorrupted Web Knight named Gladion reaches out to Kaito Yuki, a fourth-grade Web Diver, seeking aid in the battle against the malevolent forces lurking in cyberspace.