Urusei Yatsura Movie 1: Only You

Synopsis:

Ataru, the ever unlucky wretch, has the fortune to be marrying a gorgeous alien princess. Unfortunately, it’s not going to be Lum. At the age of 6, it seems Ataru accidentally engaged himself to a beautiful princess through a game of shadow tag, and being the fool he is, he completely forgot about it until now! However, the princess Elle has never forgotten, and has lived dreaming and waiting for the day when she can come and take her husband. Of course, Lum won’t stand for it, and will stop at nothing short of intergalactic warfare to keep her man!