The Apotheosis Loyal Maneuver Arms—Alma—is the flagship prototype of Enji Kamisato and Suzume Yobane, two gifted researchers disillusioned by the arrogance of their peers. Although designed for combat, Alma's daily life ironically unfolds far from any battlefield, as she is fine-tuned for ordinary society. Nevertheless, within the modest household she shares with her creators-turned-parents, she learns the subtleties of being human little by little.

Meanwhile, Enji and Suzume, as self-proclaimed rivals, remain oblivious to how transparent their affection for each other truly is. Alma, observing their every exchange with methodical precision, is hardly deceived. As the pair continue their quarrels under the guise of research, Alma adapts to the rhythm of a homely life—finding comfort in the everyday shenanigans that make them a family.