Our story begins with the protagonist, named Itsuki Tachibana. He was so weak that he couldn't even lift a sword. In 2027, the video game Phantasy Star Online 2 became the most popular game at Seiga Academy. Because of the game's popularity, it is currently under consideration whether it has a negative effect on students including Tachibana. Until one day he becomes the strongest and most overpowered in the entire server.