Cat's Eye

The protagonists of the series are the three beautiful Kisugi sisters — Rui, Hitomi and Ai — who run a café called Cat's Eye. The sisters lead a double life as a trio of highly skilled art thieves, leaving razor-thin "Cat's Eye" calling cards (adorned with a red cat emblem and capable of slicing through metal, skin and imbedding into concrete walls) at the scenes of their crimes. They steal works of art (mostly paintings) that belonged to their long-missing father, Michael Heinz, who was a famous art collector during the Nazi regime), in the hopes of him contacting them.
Toshio Utsumi, a young clumsy police officer investigating the Cat's Eye case, is the fiancé of Hitomi and a frequent visitor of the café. Proud and dedicated to his profession, he swears to capture and bring down the Cat's Eye gang, but is completely clueless about the sisters' true identities, even when his coworkers have already begun to suspect the truth. Hitomi regularly informs the police in advance about her next job, and then uses Toshio's research about the security surrounding the target to help plan the job, about which Toshio has no idea.
At the end of the series, Heinz leaves a note for his daughters stating that he cannot reveal himself yet because the mafia may kill him, but he may appear in five years' time. However, the "Heinz" turns out to be the sisters' treacherous uncle Cranaff, who betrayed Michael years earlier. After losing a final bet to the Cat's Eye, Cranaff decides to atone for his sin by setting fire to the museum, killing himself and all the crime syndicates. Hitomi eventually admits to Toshio that she is part of Cat's Eye and flees before he can arrest her. Toshio vows to track her down, attempting to "arrest" Hitomi at the airport with a wedding ring. He resigns from the police force and travels to America to find Hitomi, but finds that she has lost her memory due to a viral meningitis. Toshio spends time with her until her memories come back, and the two rekindle their relationship.

Wikipedia