A year after Kazuto and Asuna escaped from Aincrad, the deadly setting of Sword Art Online, they're still coping with the aftermath as they try to recover from the harrowing experience. Meanwhile, there's a new VRMMO game sweeping the world's gamers--Gun Gale Online. When a mysterious player who calls himself "Death Gun" claims to be responsible for real-world deaths, Kazuto (aka Kirito) is recruited to enter the game to investigate, bringing an end to his hard-won peace!

Kirito has entered the new VRMMO Gun Gale Online in order to investigate the Death Gun incidents, only to discover his avatar is not exactly how he remembers it! He barely knows up from down in this new world, and he needs an ally. He may have found one in the mysterious female sniper Sinon, but she's got an agenda of her own...

It's time for the "real" SAO--the third floor! Kirito and Asuna are hardly out the door when they stumble upon the start of the Elf War quest. When they decide to side with the elite dark elf Kizmel, they're set on a path that will push them harder than ever before. But together, nothing can stop them...right?

Kirito and Sinon's battle with Death Gun is over, but mere weeks later, something strange is afoot in the next-generation VRMMO ALfheim Online. A new duelist with a custom sword skill is defeating all comers--including Kirito! But when Asuna goes to face this duelist, she receives something she never expected: an invitation to an exclusive guild! But what is their aim? The Mother's Rosario arc begins!

Kazuto Kirigaya (aka Kirito) has beaten Sword Art Online, a VRMMORPG that transformed into a literal game of death, and returned to the real world. Unfortunately, the same cannot be said for Asuna Yuuki (aka Asuna the Flash), the girl with whom Kirito fell in love in the virtual world of Aincrad but who has yet to awaken from her game-induced slumber. As his sister, Suguha, sadly looks on, Kazuto continues to visit Asuna in the hospital in the hope of finding answers. But when one day he meets a man claiming to be Asuna's fiancé, Kazuto fears that Asuna may be lost to him forever... That is until a fellow survivor of SAO taken form the latest VRMMORPG sensation, ALfheim Online - a screenshot that features someone being held captive who looks entirely too much like Asuna! His hope renewed, Kirito dives headlong into an all-new virtual adventure, but can true love conquer the game?!

Karen Kohiruimaki always felt out of place in the real world. Due to her extreme height, she found it hard to make friends with other girls her age. Everything changes when she's introduced to VR and Gun Gale Online. In GGO, Karen is free to play the cute, chibi avatar of her dreams! Can Karen find friendship in this bullet-ridden MMO...?

Kirito jumps into a new VRMMORPG called ALfheim Online (ALO) in search of Asuna, who still hasn't regained consciousness. On his quest to find the World Tree and reach Asuna, he meets a sylph girl named Leafa. A veteran player experienced with the sword, Leafa recognizes that Kirito is motivated by serious circumstances and decides to help him. But...Leafa's identity in the real world is Suguha Kirigaya--Kirito's sister. And it's the glimmer of her beloved brother she sees in Kirito that prompts her to lend him a hand. Now, despite the conflicting interests guiding them on, the pair set off on a journey to the World Tree!!