In the near future, the students of the 3rd class B of Shiroiwa Middle School were brought to a desert island by a mysterious army. An adult suddenly appears in front of them: their former teacher Kitano. He tells them that they are going to participate in a game whose rule is to kill each other. Only the last of the survivors will be able to return home. Kitano introduces them to two very disturbing new students. Gunshots rang out to convince the unbelievers. According to the Education Reform Act for the new century, this sacrifice will make it possible to train healthy adults. Abandoned to their fate with food and a weapon, the teenagers have three days to kill each other.
Three years after the failure of the last BR program, a second act is forged and a class of students are sent to an island with one objective: kill international terrorist Shuya Nanahara.