Asuna and Kirito start with a simple day out, investigating a floating house that's become local legend in ALfheim Online, and end up chasing something stranger: Asuna keeps slipping into out-of-body episodes that feel less like a bug and more like something pulling at her directly. Old teammates join the search as the pair works through what's tugging at Asuna's very soul. The manga adapts side stories originally bundled as Blu-ray bonuses for the first two SAO anime seasons and its Extra Edition special.