The three Kisugi sisters—Rui, Hitomi and Ai—during the day run a small cafe called "Cat's Eye." To discover the whereabouts of their father, the artist Michael Heintz, who has disappeared, Hitomi and her sisters rob art galleries as the smart and mysterious thief "Cat's Eye" in the hope that his works can give them clues about his vanishing. The crucial point is that Hitomi has a relationship with Toshi, a police inspector who has sworn to catch "Cat's Eye"—and of course he has no idea about Hitomi's double life.

[Source: Anime News Network]

Hitomi, Rui, and Ai are sisters and cat burglars. They steal a painting from a museum around the same time Lupin the 3rd appears to steal another painting himself. Both paintings are part of Michael Heinz’s series titled the Girl and the Flowers. To the girls, the paintings are clues for their missing father's whereabouts. When they learn Lupin is after the same target, a fire lights inside them.

[Source: Amazon Prime Video]