Since others are also posting their "trying to find"s-
I only remember vague parts of it. A group is going on vacation of something, I just remember they're together somewhere like a hotel or airport or spaceport or something, at any rate in the end the two main dudes have some kind of epic battle on a moonscape (I don't know if it was actually outerspace or a moon it just looked alien) for the girl I think, or maybe they were fighting together against something else for the girl?
Ugh, I wish my memory on this wasn't so horribly spotty with the details. It wasn't mecha or anything like that, if anything it was similar to Urusei Yatsura. Was there a movie/episode of that where something like this happened? vague magic/alien powers/technology were used in the fight, I believe. But otherwise it had just been about that group of friends together, I think maybe they were surprised they met each other in that hotel/airport/spaceport?
DAGGONIT lol... this has been bugging me for almost a decade now. I think I saw it back in the mid-90s, on the sci-fi channel back when the sci-fi channel wasn't available to everyone and wasn't called syfy. So it's a vaguely old anime/movie like urusei yatsura. I wish I had more identifying details... literally none of the stuff I remember can be googled to any effect lol