You don't know Gunma yet (2018)

Nori Kamitsuki moved from Chiba to Gunma prefecture as he begins to attend high school. There, he has received a warning from his classmate that "No one comes back alive from Gunma," and found more negative information as he looked it up on the net. In the midst of confusion and extreme culture shock, he has gotten himself involved with Gunma's rivals, Tochigi and Ibaraki prefecture.