Kirito logs into GunGaleOnline, a VRMMO of guns and steel, to investigate the "Death Gun" incident. After transferring his game from ALO to GGO, Kirito encounters the trouble of being easily mistaken for a beautiful girl character at first glance, but after being guided by the sniper girl Shino, he successfully participates in the PvP elimination tournament "BoB" to determine the strongest gunner. In this world dominated by guns, Kirito becomes the only famous character who fights with a lightsaber and continues to win in "BoB". His unique fighting style has become the focus of discussion among players, and his popularity is rising. The next day, the official "BoB" competition held the next day begins. In the "multiplayer melee" where many powerful enemies gather, "Death Gun" finally shows up. Who is "Death Gun"? Can the "virtual world" really have an impact on the "real world"? Kirito is about to challenge "Death Gun" alone!