Mihama Academy, a special skills training school newly established by the "National Organization CIRS"... The girls who lost their homes for various reasons were handed guns and live ammunition. Reina uses a pistol, Kirika is good at sniping, Chris is good at bombs and information processing, and Saki, a ninja in charge of espionage activities. Every day, as members of SORD, they deal with incidents that the police and the Self-Defense Forces cannot solve, and continue to carry out dangerous activities. K County U Port--. An important person who was about to enter the country suddenly disappeared. SORD members began to investigate the disappearance, but every time they were about to capture the missing "luggage", it would escape just when they were about to catch it. Fighting side by side with the twin sisters of SORD members of the sister school "Kyofune Sakuragaoka", and arguing. And--the rumor of the mysterious female rider "SoulSpeed" Maki running fast in the town at night--. The pursuit eventually turned into a heroic battle to the death, tearing the body and mind apart. ...But at the same time, it is also a journey to the past before Reina and the others met.