Years later, when facing a Construct, Gongcheng Lili Hua would remember that afternoon when her brother showed her the strongest magical girl transformation, and the joy of picking out women's clothes for him (?) afterward.
Five years ago, after Magical Girl Scarlet Flame saved Lili Hua from a Construct, she had longed to become a magical girl. The Federation's "reconstituted family" policy made her siblings with a boy named Li Xiaomiao. Though Li Xiaomiao was a little dull, the two of them, both having lost their families in the war, cherished each other deeply.
To keep Lili Hua away from the battlefield, Li Xiaomiao became a mech pilot. What he never expected was that Lili Hua had secretly become a magical girl too!
To protect his sister when she was in danger during a mission, Li Xiaomiao leaped from his mech's cockpit and performed the last magical girl transformation of his life!
"Lord Scarlet Flame is actually my idiot big brother...?" Facing his confused sister, Li Xiaomiao smiled wryly. "From now on, you'll have to call me big sister."
A mech hero forced to transfer to a magical girl academy, a sister whose eyes turn into pink hearts as she picks out women's clothes for her big brother (formerly), and a magical-girl-specific mech currently undergoing maintenance... Humanity's ultimate weapon is about to finish its final adjustments in the women's changing room!