May 1, 1945. Berlin. As the Red Army raises the Soviet flag, a group of Nazi officers conduct a ritual using the slaughter in the city to bring back the LDO, supermen whose coming would bring the world's destruction. Their success remains unknown.
Present day. Suwahara City. Ren Fujii spends his days at the hospital due to a violent fight with his best friend, Shirou. He tries to value what he has left to him, but he is haunted by Shirou's words: "Everyone who remains in this city eventually loses their minds." and a recurring dream of a guillotine, murderers, and the black clad knights pursuing them.
Summary taken from: MyAnimeList