Sky Cannot Be This Blue (1993)

Original title: 空がこんなに青いわけがない

Kantarou Kobayashi is an ordinary businessman who has multiple troubles on hand. He's been having an affair with a woman working in the same company, but she does lots of eccentric things. His wife has no interrest in anything but her plan to build a new apartment where their old house is. His son suffers skin eruptions. His mother appears to have senile dementia.