Isekai'd into another world, Haruka makes use of seemingly underpowered skills to live as a lone wolf.
This is the story of Tooru Kokonoe who has enrolled at Kouryou Academy, a school which trains students in wielding Blaze, soul powered weapons to prepare them for the Dorn Agency's special peacekeeping corps. When Tooru is partnered with a mysterious girl: Julie Sigtuna, he finds he has to overcome many hurdles to ensure their teamwork and fighting skills are up to par for the duration of their training.
The "Class Black," 10th Grade of Myōjō Academy is composed of 12 assassins disguised as students and one target: Haru Ichinose. Fully aware of being the prey, Ichinose vows to survive assassination attempts and graduate from the school alive. One of the assassins, Tokaku Azuma, has started building up feelings for Ichinose and switched side to become her protector. Together they have to face the onslaught from their classmates of 11 assassins.