Lengthy (just shy of 2 hours and 20 minutes), well directed, and super well acted.
A couple cannot reproduce. They're turned to an agency that specializes in letting pregnant women who can't raise their own children give their babies up for adoption. They acquire a newborn baby through this agency. Years later but while the baby is still a child, the mother who gave him up contacts the adopted family to have him returned.
That's the plot in a nutshell, but the story is so much more than the sum of its plot, and it's directed by Naomi Kawase.
I think it's really about the complexity of attachment among other things.
I don't know if I'd recommend it to everyone, but if this is the type of movie you like, then you'll definitely like this one. Closest film I can think to relate to it is Drive My Car (2021).