Trinity Blood

Trinity Blood (Japanese: トリニティ・ブラッド, Hepburn: Toriniti Buraddo) is a series of Japanese light novels written by Sunao Yoshida with illustrations by Thores Shibamoto and originally serialized in The Sneaker. Set 900 years after an apocalyptic war between humans and vampires, the series focuses on the ongoing cold war between the Vatican, the human government, and the "New Human Empire", the government of the vampiric Methuselah. Fighting on the Vatican's side is Abel Nightroad, a Crusnik—a vampire that feeds on vampires. The novels blend science fiction, fantasy, and political intrigue, with some in the Vatican and the Empire striving for peace, and the Rosen Kreuz Order doing anything in its power to stop it.

Trinity Blood has been adapted into both manga and anime series, with continuity differences between the three versions. After Yoshida's death in 2004, his friend Kentaro Yasui aided in completing the manga, with illustrations by Kiyo Kujō. The anime series, spanning 24 episodes, was produced by Gonzo and originally aired on Wowow network. Both adaptations have the same unresolved conclusion as the final novel.