It seems that when Lum was born, a postal screw-up resulted in a witch friend of the family not getting an invitation to the celebration. The witch put a curse on Lum, that she would never be happy with her true love. In the present, a new amusement park has been built in Tomobiki, and opening day finds the whole gang sampling its pleasures. At a magic show, however, Ataru gets turned into a large pink hippopotamus! When Lum attempts to track down the magician that transformed her Darling, things start to get very weird, very fast!