Based on Sword Art Online's War of Underworld anime arc, a new story unfolds with tough challenges that await our beloved hero, Kirito, and his new friends. Players will unmask the Dark Knight and find out if they will survive the relentless battling against the forces of the Dark Territory! It's the perfect game to introduce during SAO's 10th Anniversary, when everyone can reminisce about their favourite SAO memories while meeting their favourite character again.