The background is based on the film of the same name directed by Kinji Fukasaku and starring Takeshi Kitano.
Every year, 33 teenagers are selected from each class in the first grade of any school, and all the teenagers are put on an isolated island, and they are allowed to kill each other. Only one person is allowed to survive. This is to let teenagers understand the extreme cruelty of survival and the huge pressure of adults.
Game rules introduction:
In addition to their own personal belongings, each student will receive a military backpack, which contains a map, a watch, only enough water and bread for two days, and a random weapon, which may be a knife, a gun, a GPS locator or even a pot lid, a telescope, etc.
Students are sent to different places and the game starts at the same time.
The entire island is divided into 24 areas, and one area will become a restricted area every 3 hours. Students who have not left during the game will be killed by the control ring around their neck (the ring cannot be removed, and will explode on the spot if it is forcibly removed). The game time is 3 days, and there will be only one area left that is not a restricted area. All surviving students will have a final showdown in this narrow area, and only one person can survive. If there is more than one survivor when the game time is up, all survivors will be killed by the neck ring.
The broadcast is made every six hours, reading out the list of dead and telling everyone the next restricted area.