2022年，人类实现了现实世界和假想空间的融合，电子制造商开发了名为《刀剑神域（Sword Art Online）》的在线电子游戏。SAO甫一面世便大受好评，限量一万份的名额在发售当天的短时间内便被抢购一空。通过联网，玩家可以身临其境进入充满想象力和异域风情的游戏世界——浮游城市艾恩葛朗特。玩家在这里可以生活、练武、升级、经商、探险，与真实世界别无二致，却拥有无上的乐趣。曾是少数封测玩家的桐人（松冈祯丞 配音）也是这一万名幸运者中的一员。最初的兴奋过后，玩家们却发现根本无法顺利登出游戏，更为恐怖的是，一旦玩家的HP归零，现实世界中他们的肉体也将死亡。他们被SAO的开发者茅场晶彦（山寺宏一 配音）困在游戏中，顺利逃脱的方法似乎只有一个，那就是完成困难重重的攻略任务…… 本片根据川原砾的轻小说改编。The year is 2022, and gamers have lined up on launch day for Sword Art Online, a hotly-anticipated MMORPG that lets players connect to an immersive virtual reality world with special helmets called Nerve Gear. Kirito is one such gamer who's eager to jump back into action, having spent a great deal of time as a beta tester, and quickly becomes friends with newbie warrior Klein. But soon, Sword Art Online's 10,000 players discover that not only are they unable to log out, the only way they can return to their physical bodies is by beating the 100-level tower's final boss - death in the game means death in the real world. Now, with no one else to turn to, Kirito and the other participants must survive the game as best they can.
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