Record of a Tenement Gentleman
In post-war Japan, a man brings a lost boy to his tenement. No one wants to take the child for even one night; finally, a sour widow, Tané, does. The next day, complaining, she takes the boy to his neighborhood and finds his father has gone to Tokyo; it seems the boy has been abandoned. Tané wants to leave him there, but he follows her home. The next morning he disappears fearing a scolding after wetting the bed. Tané realizes she likes having him there, searches for him, and keeps him when he's found that night. Within days, she considers him her son.
Note: The accepted English title Record of a Tenement Gentleman is a mistranslation that has stuck through the years. A more accurate title would be The Tenement Directory
An entertaining post-war social commentary from Yasujiro Ozu - one of the most optimistic of his works. However, it does occasionally stray into the realms of didacticism.
The song in this, and the way it just breaks out, is suprising and lovely.