“The Rest of Us” tells the story of three boys growing up in a melting pot that refuses to melt. José, Cristian, and Frail Boy (as the narrator is known) are street-smart kids pumped up with their own ambitions and tamped down by societal expectations. They have to figure out how to stand their ground while taking their cues from others, and the older they get, the more cues there are to sift through.