20 MENSOU NI ONEGAI!!

Akira Ijyuin lives a double life. By day, he's a top student at the elite CLAMP School, but by night he's the infamous thief 20 Faces. A master of disguise and stealth, the masked thief steals the most unusual objects at the whim of a pair of devious crime-lords...his two mothers! One starlit night, his routine is changed forever when he meets the lovely young Utako while hiding from the police. This time, Akira finds something was stolen from him--his heart.

(Source: VIZ)