AI buster follows the adventures of Albireo as he plays a beta version of what will soon be known as "The World." In his journeys, Albireo encounters Lycoris, a failed version of Aura and makes a connection that may turn out to be unbreakable.

In order for Akira to save her younger brother, who suddenly lost consciousness in the middle of playing in The World, she enters The World as the swords-woman Black Rose. There Black Rose squares off against the double-knife fighter, Kite.

Akira - also known as Black Rose - keeps fighting to save her younger brother's consciousness from "The World." But as she becomes immersed in the online game, Black Rose is beset by even further problems in the real world!

Akira once again enters the online game The World in order to save her younger brother, who has lapsed into a coma. With the virus infection now spreading to protected areas, she joins forces with Kite to unravel the mystery of the Epitaph of the Twilight and the Cursed Wave. But the two of them couldn't battle it out alone! Should they make a deal with Balmung? And should Akira reveal the secret of her brother's condition?

The World is further corrupted as the game expands into our reality. With Aura and her bracelet, BlackRose (aka Akira) discovers the answers to some important questions. They help shed light on Corbenik, the virus at the source of all the trouble. Will Akira, along with the aid of her comrades in The World, be able to save her comatose brother in time?

This novel features the giant sword-wielding Midori as she encounters Haseo on his search for Tri-Edge.

"The World" is a massively multiplayer online game played by more than twelve million people across the globe. Within this virtual world Haseo, a PPK (Player Killer Killer), continues an endless fight. However, on finally meeting with his sole lead, a PK called "Tri-Edge," Haseo is dropped back to Level 1 by a mysterious power! Can Haseo save Shino now that he has lost all of his abilities?

Suffering from extreme amnesia, high school student Saya Otonoshi can't remember anything from her life beyond the last year. Her attempts to live a normal life are shattered when a Chiropteran, a horrific vampire-like monster, attacks her. Saved at the last minute, Saya is presented with a sword that awakens in her a warrior's skills and bloodlust and sets her on a course that will lead her to the answers of her missing memories - and into battle.

Following the traces of Diva, the leader of the Chiroptera, Saya and her group make their way to Russia. But awaiting their arrival is Diva's powerful protector Chiroptera, "The Chevalier." In the middle of the battle against this new threat, Saya is told a horrible truth: "It is because you are one of us." Is Saya a human, or something more sinister...?

The monsters are winning. Saya Otonashi thought she could battle against the Chiropterans, defeat the undead monsters, and avenge the life of her adoptive father. But the creatures, led by Saya's twin sister Diva, have struck a fatal blow: their attack on Saya's adopted brother Riku has left him infected with the vampiric curse and destined to transform into a Chevalier, a half-human abomination with an unquenchable bloodlust.

In her attempts to stop Diva's plan of turning all of mankind into Chiropterans, Saya makes her way to the United States. Despite her forced rest, the time for action draws near. Meanwhile Diva, carrying Riku's children, makes preparations for the birth of the queens of the next generation! With the fate of humanity resting with the two queens, who will rise and who will fall in the final showdown?! And what of the "promise" Saya made with Haji?