Malignant infection of computer virus called "Pluto Kiss" destroys the networks of computers all around the world in 2005, subjecting the cyberspace to severe restrictions. Two years later, as free access to the networks recovers, people are now crazed over a network game called "The World." Face mounted displays enable the gamers to be thrilled by stunningly real sensations. However, a mysterious accident leaves Wave Master Tsukasa permanently logged in. Unable to log out, he stays in the cyberspace, where he encounters mysteries characters. More mysteries unfold as he discovers himself with an ability that can even harm people in the "Real World."