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The SAO Super Guide
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Introduction to SAO
Characters
Kirito
Asuna
Yui
Suguha
Sillica
Liz
Klien
Agil
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SAO worlds
Sword Art Online
Alfheim Online
Gun Gale Online
Yui
Yui is Asuna and Kirito's virtual daughter in SAO. She was designed to help with players depression and emotional problems, but over time, the system limited her from doing her job and eventually made her a mixture or NPC and an immortal object