The first arc sets up a murder mystery that actually matters: players dying in real life, traced back to a single sniper in a game built entirely on guns instead of swords. Kirito stepping into unfamiliar territory forces the show to stop leaning on his invincibility, at least for a while. Mother's Rosario abandons the mystery plot entirely and just lets Asuna carry an arc, which sounds like filler until you realize the show trusts her story enough to end on her tears instead of his victory. The polarization is real, Kirito's logic breaks constantly, and the harem setup never stops being wish fulfillment, but the arcs that land do it because they're willing to be about someone other than the protagonist.

A year after surviving the deadly SAO incident, Kirito receives an unsettling proposition from a government official. Players in Gun Gale Online, a VRMMO built around firearms, are dying in the real world after being shot in-game by a mysterious avatar called Death Gun. The connection seems impossible, yet the deaths keep happening. Skeptical but unable to refuse, Kirito logs into GGO to look for clues. There he meets Sinon, a skilled sniper haunted by a traumatic past, who helps him learn the game and is soon caught up in his pursuit. Together they enter the Bullet of Bullets, a major tournament where Death Gun is sure to appear, and what starts as an investigation becomes a race to stop a killer before he claims another life.