, School LifeYear:
Digital World, a virtual space, was born as the network society developed. There, the digital monster, which is a digital life form, was born. In Digital World, the host computer, "Yggdrasil", controls the entire world. However, Yggdrasil activates X-Program that will wipe out the old world to make a new one. Now that, Digital World is facing the biggest crisis in history.