Dies irae (ディエス・イレ, Diesu Ire) is a visual novel video game developed by Light, originally released in 2007 in Japan. An anime adaptation is planned for 2017. A manga adaptation by Kazuomi Minatogawa began serialization on January 27, 2016 in the March 2016 issue of Kadokawa Corporation's Dengeki Maoh. A novelization by Ryō Morise was released in early 2016.
Prior to the events of the story, the Longinus Dreizehn Orden, a group of sorcerers, perform a ritual in Berlin during World War II, using the lives lost in battle as a sacrifice for their spell. After the war ends, they disappear but are rumored to return. In present-day Japan, Ren Fuji is released from the hospital after recovering from a brawl with his friend Shirou, when the Longinus Dreizehn Orden returns.