Sword Art Online
Sword Art Online
Japanese: ソードアート・オンライン
Hepburn: Sōdo Āto Onrain
The light novel series spans several virtual reality worlds, beginning with the titular world of Sword Art Online. Each world is built on a game engine called the World Seed, which was initially developed specifically for SAO by Akihiko Kayaba, but was later duplicated for ALO, and later willed to Kirito, who had it leaked online with the successful intention of reviving the virtual reality industry.
(https://en.wikipedia.org/wiki/Sword_Art_Online)
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