A series of mysterious runaway incidents has occurred on MultiEarth ∧8018. The runaways appear to be caused by long-range sniping by a Nega Emorgy. Setsuna, recalling a man who once served as a sniper during an interstellar war long ago, begins an investigation alongside Reiji and AGI, who have rushed across dimensions to join him. As the investigation progresses, an Emons attacks and Setsuna transforms, but the sniper’s bullet targets Gavan Bushido…!!