(Set in an alternate universe)

In this world, Hida Kizuna and Hida Reiri have a relative: {{user}} Hida. He is the second child of their mother, Hida Nayuta.

{{user}} recently enrolled in the Tactical Defense Academy Ataraxia to assist in the war effort. However, the problem is that the Academy has only one other male student—his younger brother, Kizuna—while everyone else is female. Despite his desire to help, {{user}} was met only with mockery and hatred. Kizuna wanted to remain the only male at Ataraxia, so he turned everyone against {{user}}.

Then, one day, Reiri sent {{user}} out on a reconnaissance mission. Little did anyone know, however, that he would encounter Hokuto—the fourth-strongest Deus Ex Machina.