In the previous instalment Ataru found himself trapped in a dream of Princess Lum's making. But that was nothing compared to the chaos he's in now. When Lum was born, a postal screw-up meant that a witchy friend of the family did not get an invitation to the celebration. Feeling snubbed, she put a curse on Lum - that she will never be happy with her True Love. Consequently, just as they are about to get it together, Ataru finds himself transformed into a pink hippopotamus and Lum must find a way to save him.