D.N.Angel

D.N.Angel is a Japanese manga series written and illustrated by Yukiru Sugisaki. It premiered in Japan in the shōjo manga magazine Monthly Asuka in November 1997. The series went on an extended hiatus after the August 2005 issue, returning in the April 2008 issue. It has been published in 13 tankōbon volumes by Kadokawa Shoten. The manga series is licensed for English language release in North America by Tokyopop, which has released 11 volumes of the series as of August 2008.
The manga was adapted into a 26 episode anime series by Dentsu and XEBEC which aired in Japan on TV Tokyo from April 3, 2003 until September 25, 2003. The anime was later adapted into second two volume manga series. The manga was also adapted into a PlayStation 2 video game, and a series of drama CDs.
Daisuke Niwa is a 14-year-old boy who has a special genetic ability: whenever he sees or thinks about his crush, Risa Harada, he turns into the infamous phantom thief Dark. Satoshi Hiwatari is a student at the same school as Daisuke and the Harada twins, as well as the Commander of the police force who is heading the investigation on Dark. He is also member of the Hikari family, a clan of artists which has opposed the Niwa family of thieves for centuries.
D.N.Angel follows the adventures of Daisuke Niwa and how he must cope with his alter-ego, Dark Mousy. Because of the nature of the ability, his two friends, the twin sisters Risa and Riku Harada become involved. Other central figures include Satoshi Hiwatari, a descendant of the Hikari family who created the artworks that Dark targets in his thefts and the adopted son of a high ranking police officer. Like Daisuke, Satoshi possesses his own alter-ego, Krad.
Daisuke's family act as supporting characters in the story and aid Daisuke as he copes with the instability of his transformations.

# Reference
http://en.wikipedia.org/wiki/D.N.Angel
D.N. Angel - Complete Collection(Amazon.com)