Inoue Hisashi was a leading Japanese playwright and writer of comic fiction. From 1961 to 1986, he used the pen name of Uchiyama Hisashi. - Wikipedia
Based on a play by Hisashi Inoue, it focuses on the sufferings of the survivors of Hiroshima. The film takes place during 4 days in the summer of 1948, as the ghost of her father visits Mitsué (Rié Miyama). He had somehow learned that she has fallen in love, and tries to convince her to start her new life. But Mitsué obstinately refuses his warm and humorous encouragements : « People were killed in my place. I do not have the right to find happiness », she says.
His goal is to help the weak and defenseless, but his saving a mouse makes him the most wanted in all the land. On the run from incessant, dim-witted mice, Perro befriends a young miller's boy, Pierre; together, they decide to seek fame and fortune. When they cross paths with the lovely Princess Rosa, Perro determines to get Pierre hitched to Her Royal Highness.