Urusei Yatsura was created by world famous magaka Rumiko Takahashi. The manga ran from 1978 to 1987 with 34 volumes released. It spawned a 195 episode series and countless number of movies and OVAs.
One day, aliens from the planet Oni appear on Earth with the intent of global domination. Instead of just taking over Earth, the invaders give the human race a chance to fight back with a simple game of tag. The rules are simple, it is a one on one game of tag where the chosen human player must touch the horns on the chosen oni player within one week. Earth's chosen one is Ataru Moroboshi, perverted high school student, and for the oni side is Lum. To sum up what happens, Ataru steals Lum's bikini top and touches her horns to save Earth. However, a misunderstanding accords and now Lum thinks that she will marry Ataru and even moved in with him, and that's where the real adventure begins.
Urusei Yatsura is a very influential series for it time. Back in the late 70s and 80s, Lum was considered to the original otaku dream girl and also the original of tsundere. The musician Matthew Sweet featured clips of Lum in his music video "I've Been Waiting". Even nowadays, there anime series that are an homage to Urusei Yatsura, like To Love-Ru for example.
I highly recommend anyone to check out either the manga or anime. For those who have seen anime and/or read the manga, what are your opinions on Urusei Yatsura?