Manami Hanegi lives an ordinary high school life focused on mundane concerns like tardiness and forgotten lunches. Her routine shatters when her inventor grandfather receives a powered armor suit, the Delpower X, via helicopter delivery. This suit is specifically designed for her use, thrusting her into a world she never sought. The central conflict ignites when her grandfather employs the Delpower X to deliver her forgotten lunchbox. During this errand, he is pursued by his rival, who also commands powered armor. The rival's bodyguard, Nick Jagger, challenges Manami directly.

Faced with this challenge, she pilots the Delpower X and engages Jagger in a duel. This clash rapidly evolves beyond typical mecha combat into an intense powered armor wrestling match, featuring surprise challengers and physical techniques like German suplexes. The outcome of this singular, unconventional conflict and its consequences for her life define the narrative event.