Kaitou Amaryllis

Nana Shiizaki is an honor student by day, but no one knows that she is phantom thief Amaryllis by night. Amaryllis is a thief that steals anything by request. Nana was then scouted to make an idol debut as Flower Dream Nana, and while she spends her days happily, a mysterious organization called Black Auction begins to slowly come up around her...

(Source: Hakusensha, translated)