The fictional world depicted in the narrative features Japan as a country grappling with civil unrest and terrorism after the end of World War II, during a period of foreign occupation. The protagonist, Constable Kazuki Fuse, is a part of a counter-terrorism unit, and his mission is to put a stop to the terrorist group's underground weapon delivery. As he tries to carry out his duty, a teenage girl blows up a bomb in Tokyo, causing devastation and leaving him traumatized and doubting his own skills. After the incident, Fuse is sent to a military academy for re-evaluation, unaware of the intricate web of conspiracies surrounding him that could shape Japan's future. As he navigates through his personal struggles, Fuse eventually realizes his true allegiance.