Yep. Japanese housing is a joke. Their average apartment is about to fit into my kitchen twice. An idea to take shower standing on a toilet boil to save place for bathroom is another marvel of Japanese architecture. As for idea of a Japanese upper middle class McMansion it is even more ridiculous. A single car garage and all 1.5 levels above your 3-series BMW is your home. I guess is is not easy to fit a few kids into these lifestyles.
I know what the houses and apartments are like inside. I have a video of the babies kept in dresser drawers because there is no room for a crib. I always show it to people who thinks I’m crazy when I tell them about the lack of living space over there.