The plot... such as it is, centres around a 14 year old boy named Daisuke Niwa who's family has a terrible secret. The men in his family transform into the legendary Phantom Thief; Dark Mousy whenever they are confronted with unrequited love. Daisuke must now deal with the life of a thief, the twin girls, one of whom he is in love with and one of whom is in love with Dark and the fact that his best friend is trying to capture Dark.
This an odd little anime with a strange plotline and some very bizzare characters. However, it is quite funny and has some decent moments which set it apart from the average show.