Daisuke is a member of the Niwa family, who has for generations passed down a special ability which would transform males in the family once they turned fourteen into the notorious phantom thief, Dark Mousy, whenever they think about their crush.
They are very similar, involving romance aspects and centering around a person who has two identities. One of their identities is a normal person, and the other is a Phantom who steals different art pieces.
The two are very similar in their general plot idea: they both deal with a main character who has the duty to steal art pieces because of an old family tradition. In his everyday life, the main character makes a lot of mistakes and goes through different experiences, while behind it all stands a wanted, very famous thief.