The basic plot of Roommate is fairly simple. Ryoko is seventeen, her family has moved from Tokyo to New York, and she is staying behind to finish school. Her father (a friend of your father's) has asked that she move in with you in your apartment (where you have a spare room) so she can complete her studies. But Ryoko misses her family and is emotionally vulnerable - so it's time to for you to do some moving in of your own.