A love potion by any other name, would taste as awful. The Urusei Yatsura story comes to a climax in this animated retelling of the final Manga story. Lupa, yet another one of Lum's fiances, arrives on the scene, and Lum and Ataru have to repeat their game of tag in order to prevent the Earth from being destroyed. All Ataru has to do to win is say "I love you", the three words he has steadfastly refused to say to Lum. Will he admit his true feelings and save the Earth? Or will his pride doom it to destruction?