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We know that Yui was saved in Kirito's NervGear's local memory in the first
season of Sword Art Online but in in the second season when Kirito is in Gun
Gale Online, when everyone is watching Battle of Bullets Yui is there with
everyone else watching it in ALO. she also talks to Asuna on her phone when
she heads off to the hospital and in Agil's bar when Kirito sets up the
cameras for her.

in all of these cases Kirito isn't using his NervGear and i would suspect it
is turned off. so where is Yui now stored? and how is she able to go from this
place to ALO, Asuna's Mobile and the cameras in Agil's bar?


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2016-09-22T06:30:11.187
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sword-art-online
Where is Yui stored in SAO II?


According to [Wiki](http://swordartonline.wikia.com/wiki/Yui) page, she exists
in Kirito's NerveGear. Apparently, she connects to game servers and different
devices from there through internet connection.


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2016-09-22T07:21:37.343
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According to a [Q&A session](http://alfheim.cc/sao-2005-interview.html)1
(EX00～Face to Face～) in the third popularity contest held by Kawahara Reki, as
Kunori Fumio (his webnovel penname), in 2005:

Her core program routine runs and is stored in the local memory of Kirito's
NerveGear and takes up about 3TB.

1 Chinese-translated copy of the Q&A session


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Her program is locater in Kirito's Nervegear hard drive. Kirito during GGO
left his helm (probably turned on) in home so she can freely live in ALO.
About these devise contacting. She is a program with free access to internet
so she can connect herself to devices via internet.


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2017-05-17T13:35:03.377
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Ok here's the real answer taken straight from the 5th light novel:

> When Aincrad was on the verge of collapsing, her core program was saved to
> Kazuto’s Nerve Gear and was spared from being deleted. Currently, in
> Kazuto’s room, she was «living» inside a dedicated stationary-type machine
> prepared by him.
>
> But, direct contact with Yui was only possible exclusively under a full dive
> environment - in other words, within ALO only. Although in the real world
> you could use a mobile phone and have her there, the battery capacity was
> not long enough and they could not «always be together».

Also, it was meant to be Kirito going into GGO alone without risking anyone
else so of course Yui stayed with Asuna.


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