D.N. Angel. Volume 2. [graphic novel]

Daisuke Niwa is an ordinary, if slightly unlucky, middle school student. When he sees his crush, Risa, he transforms into his alter ego, the phantom thief Dark Mousy. Unfortunately, when Dark Mousy sees his crush, Risa's twin Riku, he transforms back into Daisuke. The only cure for this craziness is if Daisuke can get Risa to fall in love with him ...