It's three years after the events of the original Battle Royale, and Shuya Nanahara
is now an internationally-known terrorist determined to bring down the government.
His terrorist group, Wild Seven, stages an attack that levels several buildings
in Tokyo on Christmas Day, killing 8000 people.
Exactly one year afterward, the government enacts the "New Century Terrorist
Counter-Measure Alternative" program, a.k.a. the BRII act, and sends the
forty-two students of Shikanotoride Junior High Class 3-B to hunt Nanahara and
his cohorts down in their island stronghold. Shiori Kitano, the daughter of the
late headmaster of Nanahara's Battle Royale, signs up for the program, to avenge
her father.