Mayonaka no Jewel

From Shoujo Manga Maniac:
That man will take away both your heart and your body, together with the jewels... Kaitou Crow is a beautiful, unidentifiable young man who's only after jewels. Ruri, the daughter of a jewel designer, accidentally saw the kaitou while he was going for a preliminary inspection. While snatching away Ruri's first kiss to seal her mouth, Crow announced that this time, he would steal both her heart and her body, together with the jewel ... ? The dangerous love mystery of a conceited, forceful, beautiful, young, and perverted kaitou!

Since the characters of this volume are the same of the other 3 volumes, you can consider this as the 1st volume of the series!

Includes extra oneshots, Kuchizuke wa Amai Bara wa Kizuato and An Easy Mystery Better Than A Kiss.