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For Niwa Daisuke, turning 14 should be accompanied by romance and the promise of new adventures into adulthood, but instead comes with a surprising revelation: all male children of the Niwa's bloodline inherit the powers (alter ego) of Dark, a phantom thief, upon their 14th birthday! Now, in addition to his ever-present quest to win the heart of his childhood friend Risa, Daisuke must commit acts of thievery (with his doppelganger Dark controlling his body), to steal mysterious pieces of art for unknown purposes. For Daisuke, his growing pains are just beginning!