Lupica, another one of the legion of space princesses that all seem to have found out about Earth in some tour book, appears and abducts Ataru!

But Lupica is not after Ataru for his great looks or charming personality (because he does not have either). Lupica's goal is the greatest love potion in the galaxy, which she intends to use to induce her sweetheart to tie the knot. To get it, she needs the possessor of the greatest lust in the universe... obviously Lum is less than thrilled by the whole matter.

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Prequel: Urusei Yatsura: Kanketsuhen