Prior to the events of BlazBlue, humanity was on the verge of extinction from the "Black Beast", a creature of Darkness. The world was saved by six heroes who wielded magic. They helped humanity create "Ars Magus", a fusion of magic and technology, to defeat the Beast. After the war, the Novus Orbis Librarium (the Library or NOL for short) was created to govern the world with the use of Ars Magus. A great deal of dissent was caused by the Library, partly due to Ars Magus' use in nearly every facet of society, and the widening socioeconomic gap between those who could and couldn't use Ars Magus. This dissent would eventually form years later into The Ikaruga Civil War, when the Ikaruga Union openly rebelled against the Library. After the war, the Library imposed a harsher rule on the world, punishing any rebellion against the Library with the death penalty. In December A.D. 2199, several years after the Ikaruga Civil War, a branch of the Library was utterly destroyed by an SS-class rebel named "Ragna the Bloodedge" also known as the "Grim Reaper", in an attempt to destroy the entire Library. The Novus Orbis Librarium, hoping to stop him, immediately announced the largest bounty ever, available to anyone who could capture him. Interestingly, Ragna possesses a powerful form of Ars Magus known as the "Azure Grimoire" (Grimoire of the Blue in Japan), also known as the BlazBlue. This led the Librarium, as well as the Ikaruga Union and other fighters, to hunt Ragna not just for his bounty, but also his grimoire. [From [url=http://en.wikipedia.org/wiki/Blazblue]Wikipedia[/url]]

Ragna and the others were in the Union of Hierarchical Cities, called "Ikaruga". They were rebelling against the ruler "Imperator" by their own reason. As an answer for the consequences, the mankind all over the world were decomposed into "Seithr". While the power inside Ragna was forcibly provoked to be out of control by the Imperator. Thereafter, the Imperator has vanished somewhere, leaving the huge black sphere called the "Embryo". And Ragna was lost, after he transformed into his internal existence, the "Black Beast". However... Ragna is still alive. When he gained consciousness at the 13th Hierarchical City "Kagutsuchi", the power of the Black Beast was sedated. Moreover, he was still himself though, he lost all of his memory. "Now time to rebel against the end." [From [url=http://blazblue.wikia.com/wiki/BlazBlue:_Centralfiction]Blazblue Wiki[/url]] The most notable update in the game is that the Arcade has now three Acts instead of just featuring 8 battles. The first Act is named "Phantom of Labyrinth", while the second one is "Nightmare Memory", and the last and third one is called "The Replacement Blue".

Magister's City Ishana— The protagonist "Me" lives on the outskirts of the city of Ishana with her little sister in idyllic peace. However, that peace is shattered when "Me's" sister disappears without a trace. As panic begins to take a hold, "Me" starts running through increasingly more horrible scenarios in her mind. Was she kidnapped? Or is "that man" somehow behind it all? "That man" being their father, who performed dangerous experiments on his wife and eldest daughter without any explanation of his actions. Rushing to her father's workshop only served to confirm her fears as the same strange azure light that appeared when her mother died once again was leaking through the cracks of the door… After a single deep breath, "Me" opens the door and then– –wakes up without her memories in the "Phantom Field", a strange parallel world inhabited by a single person, the mysterious girl "Nobody". It is from this point that the protagonist begins her quest to find her sister, her memories, and uncover the origin of the Phantom Field. Who is "Nobody"? What is the "Phantom Field"? A new story of the "Azure" will be uncovered… [from [url=http://blazblue.wikia.com/wiki/XBlaze_%E2%80%93_Lost:_Memories]BlazBlue Wikia[/url]]