Niwa Daisuke is your average teenager, until his fourteenth birthday. He tries to declare his love to the girl of his dreams, but fails. Suddenly, whenever he thinks about this girl he turns into the legendary phantom thief known as Dark Mousy. Daisuke's mother, very much aware of this, makes him turn into Dark and steal valuable works of art for a purpose unknown to Daisuke. As the story unfolds, he learns why, and about his classmate who seems to have the same ability.
 
(Source: Anime News Network)

Daisuke Niwa is an ordinary, if slightly unlucky, middle school student. On his fourteenth birthday, he comes down with a "condition" that has plagued the men in his family for three hundred years. 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…
 
(Source: TOKYOPOP)
 
Notes: 
-Includes 5 extra chapters. 
-Volume 1 includes the one-shot "Namaiki no 'N' ("N" is for Nishiki)". 
-Volume 2 includes the one-shot "OumagaAGAIN (The Demon Returns)". 
-Volume 4 includes the one-shot "Kanno-ke wa Kanai Anzen. (Protecting the Kanno House)".

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