D.N. Angel - Double Helix (Vol. 2)
Love is never easy, and that goes double for Daisuke Niwa.  The only way Daisuke can rid himself of the phantom art thief, Dark, residing in his DNA is to have his love returned.  The problem is he has fallen for Risa who is obsessed with his alter  ego Dark.  It's Risa's twin sister, Riku, who seems to have eyes for him!