Let's change all of Japan to Gunma.
The definitive edition of the Gunma simulation game.
Everyone can play!

Story mode

You become Gunma and collect special products.
If you get a special product, you can get G (GUNMA).

Next, select the prefecture you want to change to Gunma.
Then use G (GUNMA) to draw the gacha.

The people of the selected prefecture will change to Gunma for the population of the municipalities that came out in Gacha.
When everyone changes to Gunma, the prefecture changes to Gunma.

Gunma's Ambition -You and me are Gunma- Reiwa 2nd national census edition screenshots