Synopsis: The students who enroll at the special, all expenses paid institute known as Kouryou Academy High School possess soul powered weapons known as Blaze. Established by the Dorn Agency and run by a gothic lolita named Sakuya Tsukumo, this school trains students on how to use these weapons in real fights so that after they graduate they can join the Dorn Agency's special peacekeeping corps.
The story of Absolute Duo begins on the first day of Tooru's freshman year and starts with a special Screening Rite at the opening ceremony which pits potential students against each other in a ten minute battle where only the winners will be allowed entrance into the school. After passing that first hurdle, Tooru meets a mysterious girl named Julie Sigtuna and encounters the even bigger hurdle of being made into her partner, which requires them to share a room for the duration of their stay at the academy. With new enemies on the horizon, will these two be able to learn how to coexist long enough to graduate?