Sword Art Online Series by Reki Kawahara

Kirito has escaped Sword Art Online, the forbidden VRMMORPG of death, and returned to reality. He heads off to find his game partner and lover, Asuna Yuuki. But Asuna never made it back from the nightmare. Lost and desperate, Kirito's only clue to her virtual whereabouts is a mysterious screenshot of Asuna as a fairy trapped in a giant birdcage. His conclusion: She must be trapped within the new, high-powered VRMMORPG, ALfheim Online... moreKirito has escaped Sword Art Online, the forbidden VRMMORPG of death, and returned to reality. He heads off to find his game partner and lover, Asuna Yuuki. But Asuna never made it back from the nightmare. Lost and desperate, Kirito's only clue to her virtual whereabouts is a mysterious screenshot of Asuna as a fairy trapped in a giant birdcage. His conclusion: She must be trapped within the new, high-powered VRMMORPG, ALfheim Online. Now Kirito must plunge into the world of ALO, where players are fairies who fly gracefully through the air! less

\Kirito has escaped Sword Art Online, the forbidden VRMMORPG of death, and returned to reality. He heads off to find his game partner and lover, Asuna Yuuki. But Asuna never made it back from the nightmare. Lost and desperate, Kirito's only clue to her virtual whereabouts is a mysterious screenshot of Asuna as a fairy trapped in a giant birdcage. His conclusion: She must be trapped within the new, high-powered VRMMORPG, ALfheim Online... more\Kirito has escaped Sword Art Online, the forbidden VRMMORPG of death, and returned to reality. He heads off to find his game partner and lover, Asuna Yuuki. But Asuna never made it back from the nightmare. Lost and desperate, Kirito's only clue to her virtual whereabouts is a mysterious screenshot of Asuna as a fairy trapped in a giant birdcage. His conclusion: She must be trapped within the new, high-powered VRMMORPG, ALfheim Online. Now Kirito must plunge into the world of ALO, where players are fairies who fly gracefully through the air! less

Kirito reenters the world of VRMMOs, this time logging in to Gun Gale Online in order to investigate the Death Gun, an in-game item rumored to be responsible for real-world deaths... moreKirito reenters the world of VRMMOs, this time logging in to Gun Gale Online in order to investigate the Death Gun, an in-game item rumored to be responsible for real-world deaths. He immediately runs into trouble when, after transferring his old avatar into the new game, he discovers that he looks a bit more feminine than he'd anticipated! With the help of Sinon the sniper, he enters the Bullet of Bullets tournament and tries to adapt his old skills to the new gun-based combat of Gun Gale Online. He'll need every friend he can get and every trick in the book, though, to crack the mystery of the Phantom Bullet and learn the truth about the Death Gun! less

In an effort to discover the truth behind Death Gun, Kirito has entered the Bullet of Bullets tournament in Gun Gale Online, and both he and Sinon the sniper girl have made it to the finals, and the reality of what they discover is stranger than anything they could've prepared for. Lives are on the line once again as Sinon is forced to face her own past--but can Death Gun's bizarre rampage be stopped in time?

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 dualist with a custom sword skill is defeating all comers--including Kirito! But when Asuna goes to face this dualist, she receives something she never expected: An invitation to an exclusive guild! But what is their aim? The Mother's Rosario arc begins!