友引高中2年4班的学生诸星当，堪称史上最好色的男子，虽然有青梅竹马的阿忍，但他仍然四处搭讪，为了美女命都可以不顾。　　某天外星鬼族入侵地球，鬼族首领要求双方各派出一名代表，通过赛跑决定地球的命运。一向厄运缠身的阿当成了当之无愧的中彩者，鬼族则派出首领的女儿——身穿比基尼，吊眼梢，会飞会放电的小美女拉姆。这场重要的比赛最终以阿当获胜告终，而拉姆却爱上了这个不着调的对手。从此，他们的命运被紧紧联系在一起，也由此引发了一系列神奇、爆笑、感人的小故事……The series begins when aliens from the planet Oniboshi invade Earth. They agree to leave only if Earth's champion can defeat the Oni champion in a game of tag within a ten-day time limit. Earth's champion, randomly selected by the aliens, is Ataru Moroboshi, a Japanese teenager with highly overactive hormones. The alien competitor turns out to be the curvaceous Lum, so Ataru relishes the idea of having to catch this beauty. However, his attitude changes when he discovers that Lum can fly. When things start looking desperate for the Earth, Ataru's girlfriend, Shinobu offers to tie the knot if he succeeds, and on the last day, when he finally catches Lum, he declares his intentions to be married. Lum misunderstands this as a proposal and eagerly agrees, since she has become smitten with Ataru. He tries to disengage himself, but Lum is adamantly faithful and demonstrates a willingness to use her natural ability to generate electric shocks to keep her "husband" in line. Later in the series continuity, Lum and some of her alien friends become more-or-less regular residents of Tomobiki and interact with the natives, who are interesting in their own right. Urusei Yatsura is unique for its premise, its immense cast of characters, and its free-for-all, anything-can-happen attitude. Too bad they can't get away with this on American TV.

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