Today’s update for the Japanese version of Sword Art Online: Lost Song, titled “Weapons Instrumentalist,” comes with a surprise guest character: Accel World‘s Kuroyukihime.

What’s Accel World’s greatest doing in Svart ALfheim? And how will she encounter Kirito? We’re not sure, but those are the teasers offered by Dengeki.

Watch a trailer for the new update below. Or, if you have a copy of Sword Art Online: Lost Song, download the update now and play it for yourself.