In 1XXX B.C., there existed an extremely advanced ancient civilization with highly developed electronics and networking technology. However, the civilization engaged in a cyber war with a neighboring country. After ten years of conflict, the advent of a single program put an abrupt stop to the conflict, and both civilizations became lost to history. In the present day of A.D. 20XX, as the threat of cyber crimes increased, the Ministry of Science founded NetPatrol, a secret internet security organization made up of both civilian and Official NetBattlers. Netto and Enzan were selected as the NetPatrol members of Akihara Town and the Government Complex, respectively.