The series revolves around the Kisugi sisters, Hitomi, Rui, and Ai, who operate a café named Cat's Eye. However, the sisters lead a double life as art thieves of remarkable skill, leaving behind calling cards bearing the name "Cat's Eye." Their thievery primarily focuses on reclaiming artworks, mainly paintings once in the possession of their father, Heinz, who vanished many years ago. During the Nazi regime, Heinz was a famed art collector. The sisters desire to reunite with their father and hope that their actions will prompt him to reach out. Toshio is the police officer tasked with investigating these heists and is engaged to Hitomi. Despite his relationship with a member of the gang, Toshio is determined to bring the Cat's Eye Gang to justice.