Right before Cat's Eye can nab another of their father's paintings, the owner is murdered and the picture stolen, and Cat's Eye ends up being implicated as the culprits. On top of that, the mastermind behind the theft turns out to be a corrupt politician, who exploits that opportunity to further frame Cat's Eye in order to ward off suspicion. His scheme forces the Kisugi sisters to break into the heavily secured National Diet Building to prove their innocence, expose the politician as the villain he is, and regain their father's stolen artwork.