“Rental Family,” a moving drama from Searchlight Pictures starring Brendan Fraser, is sure to spark interest in Japan’s real-life industry. The film, which opens in theaters Friday, centers on Phillip, an American actor who is recruited by a Tokyo “rental family” agency. It isn’t long before Phillip starts to become emotionally invested in what were supposed to be superficial relationships. The film’s Japanese supporting cast also bring to life the intense highs and lows of assuming a role in a stranger’s life. In reality, these niche businesses highlight how deeply people in Japan experience loneliness and worries about saving face.