Hi guys, I'm looking for a specific manga which I read the first chapter of ages ago. It was about a girl and a boy in a school. I think the chapter followed the boy's point of view and he met the girl for the first time. She was definitely quirky or odd and he may have been too, but I more remember him being a bit quiet or unsociable. They pretty much just met (I remember it being on a stairway) and they exchanged words which I think the boy had a surprised reaction to, then suddenly there was a giant mothership style UFO. It could be seen in the school windows and they ran outside to see it. One of them may have got on a bike? Not sure at that point. I remember the art style being quite simple, not chibi style but not super hd realistic, though it could easily be somewhere in-between. Also as far as I can tell it isn't Dead Dead Demon's Dededededestruction. Though the first chapter and character personalities are vaguely similar to that set up.

Thanks for taking the time to read it~ Hopefully someone knows what it is, been bugging me for a while..