The background is based on the film of the same name directed by Kinji Fukasaku and starring Takeshi Kitano.
At the beginning of a new century, a country is on the verge of collapse.
The complete unemployment rate exceeded 15%, with more than 10 million unemployed people.
800,000 Students resisted the [institutionalized] campus system;
Juvenile crime rates are rising;
Students are completely desperate for adults and violence is frequent;
Adults lose confidence and fear minors.
So, they passed a bill, the "New Century Education Reform Act" [commonly known as the BR Act].
Every year, 34 teenagers are selected from each class in the first grade of any school, and all the teenagers are placed on an isolated island, where they are allowed to kill each other and only one person is allowed to survive. This way, the teenagers can understand the extreme cruelty of survival and the huge pressure of adults.