The Story of Urusei Yatsura
One day an extremely lecherous teenage boy named Moroboshi Ataru was walking home when he is distracted by a pretty girl and gets hit with a fly ball from a nearby baseball game. He then meets a short weird old man named Cherry who tells him that he has a horrible face, when Ataru gets angry (as anyone would at such a remark) Cherry quickly explains himself by saying that he meant that Ataru's face showed that he would have terrible bad luck, and tells Ataru not to go home a certain way. Ataru scoffs at the old man and remarks that, that is the way he always goes home. It's not very long after Ataru sets off for home yet again when he is pulled into a mysterious car and taken home. This is where he then finds out that aliens have come from another planet to invade Earth, and a computer had randomly picked Ataru to defeat the aliens and save Earth. He is to do this by having a ten day race in which Ataru has the grab an alien's horns, the alien being the beautiful Lum. If Ataru manages to do this then the Earth will be saved, but if not, then the aliens will take over. At first Ataru refuses to do this, but is given an incentive when his girlfriend Miyake Shinobu promises to marry him if he wins. The race begins and for the first nine days Ataru is unable to grab Lum's horns, probably because of the fact that Ataru was unaware of the fact that Lum could fly before the race started. But on the tenth and final day he manages to grab Lum's top off, dismayed, Lum tries to get it back giving Ataru the chance to grab her horns, which he then does. Ecstatic at his victory he yells out happily that now he can get married, Lum thinking that he wants to marry her agrees happily and no one will listen to him when he tries to explain that it is a misunderstanding, making Shinobu of course very angry.
And so Urusei Yatsura one of the most insane anime's of all time begins.