Maledictus Luna
After the events of 13th Hierarchical City: Kagutsuchi, A young boy named Carl Clover sets off to Ikaruga along with a Nox Nyctores, Deus Machina: Nirvana, who had happened to be his older sister, Ada Clover, To find the Azure Grimoire in hopes of reviving her. Little does he know, an evil spirit started running amok...