BlazBlue: Calamity Trigger (ブレイブルー カラミティ トリガー BureiBurū: Karamiti Torigā) is a fighting video game developed by Arc System Works. The game was originally released for the Arcade in Japan on November 19, 2008. The game was ported to the PlayStation 3 and Xbox 360 on June 25, 2009 in Japan and on June 30, 2009 in North America.
At the end of December AD 2199, a person who rebelled against the Control Organization appeared in the 13th Hierarchical City of Kagutsuchi. It was Ragna the Bloodedge, the SS-class rebel with the largest bounty in the history. He was said to have power comparable to that of a country’s army. He destroyed several branches of the Control Organization, all alone. Aiming for the large prize for capturing the rebel, dead or alive, and getting the unspecified power possessed by him, various vigilantes gathered in Kagutsuchi.
However, Ragna’s real task was to destroy Kilns in every Hierarchical City, which exist deep underground of the Control Organization branches, and to prevent smelting of an artificial human, Nu-13.