Set in the 13th hierarchical city, Kagutsuchi, the Librarium regulates the amazing power of "Armagus", a fusion of magic and technology. Currently they are aft er a wanted criminal named Ragna The Bloodedge, also known as "Death", who wants to destroy the Librarium. Due to Ragna possessing a powerful form of Armagus known as the Azure Grimoire, people far and wide are aft er not only his bounty, but his grimoire as well. This is where our story begins...