Well just get a divorce already and move to another place.
Problem solved.
I love how the Japanese standard way of living be like described in this manga. A stressful life, forcing one to get married especially females, having kids.
Yep, a "Happy Life".
It's not the guy's fault for not wanting to have kids early even though their families will be bugging them for long. Having kids may lead to a more stressful life especially if they weren't ready for it.