In the year 2100, children have become Web divers and uploaded their consciousness onto global computer networks. They play in a cyber park called the Magical Gate. One day, a mysterious computer virus appears and begins to destroy the Magical Gate. Programs called Web Knights were created to protect the children from the virus but the virus turned all the Web Knights against the children. The only Web Knight to escape this is Gladion. Gladion seeks the help of Kento Yuki, a Web Diver who is in the fourth grade.

　　背景发生在2100年，故事开始时，一个叫魔法之门的服务器遭到来自外太空的电脑病毒入侵以致瘫痪，并企图征服全地球，守卫魔法之门的十三个网络骑士当中十二个受病毒操控，主角的弟弟被困，于是主角健与最后一名网络骑士并肩作战，唤醒了所有网络骑士。 经过连场激战后，电脑病毒实体化，然而由于健的努力最后被消灭。