Dies Irae is a Japanese visual novel and anime series set in an alternate history where a secret society with sinister intentions attempts to bring about the apocalypse. The series follows protagonist Ren Fujii as he becomes entangled with this society and its supernatural members, leading to epic battles and philosophical confrontations. Known for its complex narrative and themes of existentialism and fate, Dies Irae has garnered a dedicated fanbase. The anime adaptation was released in 2017.