As Kirito, Asuna, and Alice brave the wilds of the mysterious VRMMO Unital Ring, Sinon's introduction to the world is equally harrowing. After numerous setbacks, she finds herself without friends or equipment--and barely any thirst points left to her name. Backed against a wall, she'll need to defeat a terrifying boss monster to survive. Meanwhile, Kirito's group splits up in order to search for Sinon and defend their home, unaware that a mysterious assailant lies in wait.