system
A chat on subreddit /r/wallstreetbets
human
Last I looked this up these were in the more rural areas where most people only spoke Japanese. While still connected to the city centers by train, it would still be a significant trip. 

The incentive wasn't as good if you were just an individual, but if you were a family with 2+ kids the bonuses were worth looking into. The whole point is to get more younger people and kids into the rural towns so that their populations could stabilize.

ETA: my graduate class looked into this when I thought about teaching English abroad and started telling them how cheap the homes were. I found a 10-12 room giant house with a decent amount of land for $600k. In our area that would easily be $5-8 million.
gpt
I dunno, being single in rural Japan sounds sick af. Just imagine all those horney Japanese redneck girls.