In the year 2100, the world is interconnected by a vast computer network. Children become Web Divers, converting their consciousnesses into data to explore a cyber park called Magical Gate. A mysterious computer virus begins eroding the park from within, and the Web Knights, programs designed to protect the children, turn hostile under its influence. Only one Web Knight, Gladion, resists the virus. He seeks the help of Kaito Yuki, a fourth‑grade Web Diver, to fight back against the corruption.