Giant Ojousama

Oriko Fujido is heir to a conglomerate that dominates the vending-machine industry, and her father gave her an entire city when she was only four. After ten years spent nurturing it into a prosperous home, an unidentified giant invader appears and threatens everything she built.

Her eccentric butler and scientist, Dr. Sebastian, gives her an experimental energy drink that makes Oriko grow taller than the city's skyscrapers. She barely repels the first attack, but it is only the beginning. Whenever a new giant threat arrives, the young vending-machine heiress becomes the largest line of defense for the city she considers her life's work.