Why are there so many Nepalis in Japan?

Hello!

I'm an American living in Japan, and one thing which surprised me is how many Nepali-run Indian restaurants there are. There is a huge density of Indian restaurants in most cities, and they are almost all Nepali-run. I quite like these restaurants, as they are usually affordable and delicious, but I am very curious: why do so many Nepalis go to specifically Japan?

I hope this isn't an ignorant question, by the way. Y'all seem like cool people, I was just caught off-guard by how big the Nepali community is in Japan. It would be particularly cool if any Nepalis on this sub live in Japan and could provide insight.

Thanks in advance!