I had absolutely no trouble getting dates here when I moved here. There must have been something about your friend that just isn't attractive to Japanese women. Is he religious, overweight, or have a beard? You can't expect a person to be equally attractive to any arbitrary group; different cultures have different standards.
Even if you want many kids, your potential partner might want kids, too, but feel pressured to have them right away if you say 4.
No one wanted kids, he's slight above average looking japanese man with good personality but whenever he tried to get commitment, he got dumped even if relationship was several years long.
He told me it's because they don't want to take risk.
Interesting story, but talking about commitment and having kids is something you need to do before you're even seriously dating someone; it's not something you wait several years to bring up. What you're looking for in a relationship and what you want out of one in the future is one of the most basic compatibility factors in a relationship, so it should be discussed after a few dates or so.
I kinda feel like something's missing from this story.
Most people only ask "if you are open to having kids in future"
Followed by rough estimate of timeline which may or may not materialize with the same person.
A lot of people don't really know much about themselves, change their mind later, or give the compatible answers because they don't wanna lose the anticipated benefits of being with this person.
Why does he need to breed 4 children?
This reads so awful
So he married a woman from India and now they've 4 kids.
It wasn't about money, no one was willing to make this sacrifice for him.