Eleven years after the launch of internet-connected augmented reality eyeglasses and visors, Yūko Okonogi relocates with her family to Daikoku City, the tech hub of the burgeoning half-virtual world. Yūko becomes part of her grandmother's "investigation agency," a group of children outfitted with virtual gear and potent metatags. She soon encounters Yūko Amasawa, a skilled hacker of the virtual realm, who is persistently trying to "unlock" the secret of a computer virus originating from an unreachable, corrupted zone.