In the near future, a Virtual Reality Massive Multiplayer Online Role-Playing Game (VRMMORPG) called Sword Art Online has been released where players control their avatars with their bodies using a piece of technology called Nerve Gear. One day, players discover they cannot log out, as the game creator is holding them captive unless they reach the 100th floor of the game's tower and defeat the final boss. However, if they die in the game, they die in real life. Their struggle for survival starts now...
Denji has a simple dream—to live a happy and peaceful life, spending time with a girl he likes. This is a far cry from reality, however, as Denji is forced by the yakuza into killing devils in order to pay off his crushing debts. Using his pet devil Pochita as a weapon, he is ready to do anything for a bit of cash.
Shigeo Kageyama, a.k.a. "Mob," is a boy who has trouble expressing himself, but who happens to be a powerful esper. Mob is determined to live a normal life and keeps his ESP suppressed, but when his emotions surge to a level of 100%, something terrible happens to him! As he's surrounded by false espers, evil spirits, and mysterious organizations, what will Mob think? What choices will he make?
