A lyrical, heartbreaking story based on a scandal that shocked Japan, Kore-eda’s “Nobody Knows” considers the precocious self-sufficiency of four children who band together to survive. Soulful young actor Yagira is a marvel as Akira, a kid who longs to live a normal childhood but shoulders the burden of caring for his sister Kyoko (Kitaura) (who handles house duties), and a toddler-age brother and sister. As conditions inside the apartment worsen, the children become more dishevelled, and their plight sadder. Kore-eda’s use of natural light and wrenching images of toys gives all this pathos a poetic veneer. The result is a film of strange, disarming beauty that packs a wallop.