Yes, I am aware of Japan's herbivore culture - but that culture was more to do with Japan being ultra hyper capitalistic and ultra-traditional, which is why tradcon types and MGTOW types mock each other.

Japan is suffering from its own success - the culture went from being a cohesive collectivistic society to one that has some, but not all of the benefits of Western culture. Oppressive corporate environments with shit worker rights, skyrocketing rent prices, lack of urge to own long term assets. Men have basically gave up and checked out of society and women is going through its own second-wave feminism bit with women basically "realizing" they don't need no man and can delay getting kids until much later.

I'm sure there are way worse things going on in the back, you don't have to elaborate. I see the parallels and it's not good. They have some old parts of their culture keeping it at bay but I can see the parallels between the US and Japan when it comes to cultural decay.