In recent years, the Tokyo International Film Festival has transformed itself into one of Asia’s most cosmopolitan showcases of global cinema. Once known primarily for auteurist Japanese works, its 38th edition, which closed Wednesday, featured films that underscore the ways migration is both a lived experience and a moral inquiry. Five films in particular — “Mother Bhumi,” “Lost Land,” “April,” “The Blue Trail” and “Little Amelie or the Character of Rain” — feature migration narratives that