With no means to return, aliens obtain Japanese citizenship and begin a home-stay program with regular families and schools.
The full thirteen episode run is available on the service in its original Japanese with English language subtitles.
Based on the manga by Peach-Pit, the thirteen-episode series DearS animated by Daume that ran back in the summer of 2004 is now streaming on the AsianCrush streaming service.
As he brings her home to care for her, he finds that she is quite possibly one of the DearS.