Zero-to-hero movies, usually about athletes or musicians or other folks engaged in something competitive and cinematic (baseball, yes; darts, no), are a staple of the film business in Japan. One reason: Audiences here admire gaman — the perseverance the protagonists display in pursuit of their group or individual goals. Another reason: They enjoy a good cry and these films reliably deliver, usually with a final heart-warming, tear-wrenching triumph.