Understand
Gunma is a rural part of Japan with hot springs, a safari park, and plenty of hiking.
For anime fans, Gunma is also the backdrop for the popular street racing/drifting anime called "Initial D".
Gunma prefecture is said to be shaped like a crane in flight, so there is a card - Tsuru mau katachi no gunma-ken in Jomo Karuta Japanese card game.
In general, Japanese women are strong and they called "Kakaa-tenka". It means a man married a woman from Gunma is henpecked.