Gabriel Miller-assuming the identity of Emperor Vecta, the god of darkness-prepares to invade the human lands with his army of fifty thousand. Defending these lands are the remaining Integrity Knights, led by Commander Bercouli, and an army one-tenth the size of the enemy's! Meanwhile, Kirito, still out of commission, is left in the care of primary trainees Ronie and Tiese. And back in the Dark Territory, Dee Eye Ell, the chancellor of the dark mages guild, threatens to vanquish the Human Guardian Army by launching a large-scale magical attack of her own. But in the midst of the chaos, the one who appears to turn the tide of battle is none other than...Asuna?!

Two years after waking up in a mysterious fantasy world, Kirito and his oddly human NPC friend, Eugeo, continue their quest to become Integrity Knights--and find Alice, who disappeared so long ago and yet has somehow lingered in the back of Kirito's mind. Their journey takes them to the Imperial Swordcraft Academy, where they must train to become two of the top twelve seats in the class to have even a hope of seeing Alice again. Meanwhile, as Asuna desperately searches for Kazuto Kirigaya, she stumbles across the deeper secret of his new world...

Following a mighty clash, Kirito and Eugeo find themselves separated for the last leg of their journey to the top of Central Cathedral. Kirito, forced into an unlikely alliance with Alice the Integrity Knight, continues his climb from the outside, while trying not to fall to his death. At the same time, Eugeo must face off against the Integrity Knight Commander himself, Bercouli Synthesis One! Although the journey is nearing its end, they'll soon learn that the cathedral is still full of surprises...

READ THE NOVEL THAT IGNITED THE PHENOMENON! Kirito has faced innumerable hardships in the two long years since he first awoke in the Underworld, but his greatest battle yet lies ahead. As they near Administrator's chamber at the top of Central Cathedral, Kirito and Alice confront a heartrendingly familiar foe on the ninety-ninth floor. The final obstacle standing before them is none other than Eugeo...wearing the armor of an Integrity Knight! Can Kirito's cries reach Eugeo in the tortured recesses of his mind? Or will Administrator have the last laugh?!

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!

★掀起話題新世代網遊鉅作，在作者個人網站連載時創高瀏覽記錄。 ★多采多姿的遊戲世界引人入勝，於2012年動畫化。內容介紹 由整合騎士貝爾庫利所率領的五千名人界守備軍， 對上了由闇神貝庫達，也就是加百列．米勒所率領的五萬名侵略軍。 以「天穿劍」法那提歐為首的整合騎士，雖然為了扳回數量上的劣勢而不斷奮鬥， 但敵軍──山地哥布林族卻利用奸計穿越防衛線，突擊後方的補給部隊。 少女練士羅妮耶與緹潔由於在後方保護心神喪失狀態的桐人，也因此而面臨了危機。 再加上侵略軍當中最為詭計多端的暗黑術師總長蒂伊．艾．耶爾 也企圖以恐怖的大規模術式來殲滅守備軍…… 而登入Underworld的亞絲娜又身在何處？

Gabriel Miller nei panni del dio delle tenebre Vector guida un esercito invasore di cinquantamila unità contro le cinquemila dell'esercito di difesa del mondo umano, comandate dal Cavaliere d'Integrità Bercouli. I Cavalieri d'Integrità, a cominciare da Fanatio con la sua spada che trafigge i cieli, resistono sperando di rovesciare il terribile svantaggio numerico, ma la tribù dei goblin di montagna ha un piano per superare le linee difensive e attaccare le truppe di supporto nelle retrovie.