Daisuke Niwa is an ordinary middle school student who has an inherited an interesting family tradition. Upon seeing Risa, the girl he adores, he transforms into a daring phantom thief. When the phantom thief sees his own object of desire, he turns back into Daisuke. The only way to cure this craziness is if Daisuke can get Risa to fall in love with him, but how can she love someone she can't see?