Ragna the Bloodedge. That man is nicknamed Grim Reaper and possesses the power of Azure Grimoire. Yet, he awakens in an unfamiliar land and has lost both the Azure’s power and his memory.  In this unknown world, he comes across Celica, a girl who is able to use healing magic, and a beastkin warrior named Mitsuyoshi. Their journey is closely related to the Black Beast, a being which drive humanity to devastation. However…

The 15th Hierarchical City of Torifune is best known as the Military Academy for the NOL. There, future librarians train and hone their skills for whatever challenges may await them outside. The story centers around Mai Natsume, a girl who had just arrived late due to a week absence, but there seems to be several phenomenons centering around her that could be more than just coincidence.