Akatoki Hoshi Residence Mangaあかとき星レジデンス, Aka Toki Hoshi Residence
A guy living a boring and meaningless life meets Touko, a pretty girl, and it turns his life around. They get married, but three months later she tells him she is an alien from a far away planet, and that she must return to her home planet in a few days. Is she making excuses? Is she really an alien? Will he let their marriage end so easily?.