Amidst a popular online role playing game in the near future, characters try to play out the goals they set for entertainment and passing of time. The MMORPG known as The World is one full of monsters, player characters and dungeons. Tsukasa is a detached and introverted character that has a number of mysteries about his player character. Many weird happenings seem to surround Tsukasa. His relationship to a rare item called 'The Key Of The Twilight' sparks Tsukasa's meeting different online characters and the befriending of their real life counterparts.