During the day, the three Kisugi sisters—Rui, Hitomi, and Ai—run a small cafe named "Cat's Eye." To find their missing father, the artist Michael Heintz, Hitomi and her sisters rob art galleries as the clever and enigmatic thief "Cat's Eye," hoping his works will provide clues to his disappearance. The complication is that Hitomi is involved with Toshi, a police inspector sworn to capture "Cat's Eye," who remains completely unaware of her double life.