La lluvia negra la constituyen las particulas radiactivas procedentes de la explosión de las bombas que Estados Unidos lanzó sobre Hiroshima y Nagasaki. Basada en una famosa novela de Masuji Ibuse sobre la devastación causada por la bomba atómica, "Lluvia negra" relata las consecuencias de la explosión atómica en Hiroshima. La película se centra en la historia de una joven, Yasuko, que se vio sorprendida por esta lluvia radioactiva que cayó en los alrededores de la tristemente célebre ciudad. Las posibles consecuencias de su contacto con la radiación han dado lugar a un sinfín de habladurías entre los pretendientes de la joven: ¿estará enferma?, ¿podrá tener hijos? Su familia rememora aquellos días aciagos, tratando de conjurar el peligro que la acecha.
When Yumiko Tsuyama, a potter by profession, comes inquiring about a room for rent in an old mansion overlooking Osaka, she finds a bizarre collection of characters already living there. The unlikely leader of this menagerie is Yoda Goro, who speaks four languages fluently, is an expert in cabbage rolls, and has written how-to books encompassing every aspect of human existence.
Okoma, a witty young woman working as a conductor in an old, rickety bus in Kōfu, Yamanashi (rural Japan), has a creative idea that could avert the dwindling number of passengers when her job and the bus company itself are at stake.
Emi Ota and her friend Okiku stay briefly at a mountain inn and then return to Tokyo. Later, Nanmura, a soldier on leave, steps on an ornamental hairpin in the public bath at the inn. Emi writes to the inn saying she has lost a hairpin and, when she discovers that it injured Nanmura, returns to apologize. The longer term visitors at the inn meet together to discuss the hairpin incident. These include a grumpy Professor, a young couple Mr and Mrs Hiroyasu, and an old man staying with his two grandsons. They hope to see a romance blossom between Nanmura and Emi, after Nanmura declares that there is something almost poetic in finding a hairpin in the bath.
