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Only You is the first movie in the Urusei Yatsura movie franchise.
Tomobiki is rocked to the core after almost all of the regular cast recieve invitations to Ataru's upcoming wedding... not to Lum, but to another alien princess, named Elle.
The film begins with a trippy sequence that resembles a half-remembered dream, of two children playing shadow tag in a school playground at sunset. The boy manages to step on the girl's shadow, where she tells him that she is now obliged to marry her. She leaves the boy with the promise that she will pick him up 11 years later.
In the present day, almost all of the regular cast of Tomobiki, apart from Ataru, receive invitations to a wedding between Ataru Moroboshi and the mysterious "Elle". Ataru claims he knows nothing of the invitation, or of Elle, even when Mendou, Shinobu, Megane and his gang and Lum herself attempt to beat it out of him. But when a spaceship descends upon Earth, bringing news of Elle's wish to marry him, Ataru is all too willing to go ahead with the proposal.
Despite Lum's attempts to steal Ataru away to elope with him before Elle can get him, Ataru and the rest of the Tomobiki regulars find themselves on Planet Elle, where Ataru finally meets Queen Elle, and move ahead with plans of marriage. Ataru is all for it: he considers the fact that he'll be king of Elle to be a stepping stone to his own decadent harem on the planet.
But it soon turns out that Elle has a hidden habit of her own, and Lum will soon descend on Planet Elle to get her fiancé back...