Forget-me-not

Forget-me-not (フォゲットミーナット) is a manga series by Kenji Tsuruta. It was serialized in Morning.

Plot
Mariel Imari is a private detective trying to become a first-rate detective to be able inherit her late father's estate. By some strange reason the mysterious thief Vecchio is taking an interest in her. If that's not enough her old friends at Interpol and her siblings makes life more troubling for her.