Yui

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Yui?(ユイ,?Yui?), officially named ?Yui-MHCP001? (Mental Health Counseling Program 001), is a supporting character throughout the?Sword Art Online series. She is a top-down?Artificial Intelligence?(AI) program that was originally developed by?Argus?to address player mental health concerns in?Sword Art Online?(SAO). However, when?Kayaba Akihiko?turned Sword Art Online into a death game, Yui was forbidden from interfering with players whatsoever by the?Cardinal System, which led to her collapsing due to being forced to monitor player mental health without being able to fulfil her duties. Found in this broken state by?Asuna?and?Kirito?around the forests of the?22nd?Floor?of the floating castle?Aincrad, she was mistaken for a lost child player and adopted by the couple. After recalling her actual identity in a?Hidden Dungeon?on the?1st?Floor, Yui ignored the Cardinal System's orders and exercised her Game Master rights to save Asuna and Kirito from?The Fatal Scythe, which led to her being