Sword Art Online is a virtual reality MMORPG where players immerse themselves in a massive fantasy world with medieval themes, magic, and swords. The game is played using a device called Nerve Gear. The players soon discover they are unable to log out of the game, and the game's creator Akihiko Kiyaba informs them that the only way to escape is to reach the 100th floor of the game's tower and defeat the final boss along with the fact that if they die in the game, they will die in real life.