Spring 1986, Kabane Kazuya (かばね和也), a third-year high school student, struggles with the pain of a traumatic event that he cannot even properly recall, and as a coping mechanism, he has turned to a life of juvenile crime. However, when he gets caught up in a Cold War plot and a new, more sinister threat with a familiar face, his home is thrown into chaos and on the verge of multiple world-ending apocalypses. As Kazuya delves deeper into the mysteries surrounding him, he starts to question the true nature of the forces at play and the cost of uncovering the truth in a world where some secrets are better left DEAD.