20 Mensou Ni Onegai!!
Other titles :
20面相におねがい!!, 20면상에게 부탁해, Man of Many Faces, The Thief with 20 Faces, Le Voleur aux Cents Visages (french), Tjuven med 20 ansikten (swedish)
From Tokyopop: Akira - who later appears in the CLAMP School Detectives manga series - is a dapper, debonair young thief-for-hire who becomes the object of 5-year-old Utako's affections.