The story takes place in the city of "DENCITY" where the Internet system is well developed. There is a VR space called "LINKVRAINS" built by the giant company "SOL Technology" using advanced network technology. People are crazy about experiencing a new duel in that VR space. However, in "LINKVRAINS", a mysterious hacker group "The Knights of Heinoin" appears, which uses duels to carry out hacking. Their goal is to destroy the "world of AIs = the electronic world" that exists somewhere on the Internet. However, when the world is threatened by this, a duelist stands up. His name is "Playmaker". In that legendary battle, "Playmaker" used an overwhelming duel to defeat the "Knights of Heinoin" and successfully captured the mysterious AI program that both "SOL Technology" and "The Knights of Heinoin" wanted to get. He once saved the world, but then suddenly disappeared, and his name became famous in the world of the Internet in an instant and became a legend. Now, Yusaku Fujiki, a high school student who is the true identity of “Playmaker”, is chasing the “Hinoin Knights” who have reappeared in “VRAINS” in order to find out the truth about a certain incident in the past. With this as an opportunity, the gears of fate begin to turn... The true identity of the mysterious AI, the purpose of the “Hinoin Knights” targeting “LinkVrains”, and what is the truth hidden in Yusaku’s past - all the answers are in “LinkVrains”.