Plot
Three years after escaping the Battle Royale program, Shuya Nanahara and previous winners of the death game form the Wild Seven, a guerrilla group who oppose the Japanese authoritarian government. The Wild Seven declare war “against all adults” by destroying the Tokyo Metropolitan Government Building in Shinjuku, killing eight-thousand civilians in the attack. In response, the New Century Special Anti-Terrorism Act (or “BRII”) is initiated, forcing high school students to combat terrorism in an altered version of Battle Royale.
Shiori Kitano, daughter of the late BR instructor Kitano, volunteers for the new program to learn why her father idolised Noriko Nakagawa over her. She is transferred to Shikanotoride Middle School, joining Class 3-B, consisting of delinquents and troubled children, many who lost families in the terrorist attack. Amongst them is the hot-tempered Takuma Aoi, his best friend Nao Asakura, diabetic Haruka Kuze, and rugby team captain Shintaro Makimura.
On a staged field trip, the class are driven onto a military site and placed in a holding pen. Their teacher Riki Takeuchi enters, informing his students that they are to infiltrate the Wild Seven’s remote island base and kill Shuya within three days. As with past Battle Royales, the students wear explosive neck collars that will be detonated if they disobey orders. However, each student’s collar is linked to another, and will detonate if their counterpart dies. When Shintaro refuses to participate, he is executed, leading to the death of Kazumi Fukuda. The remaining forty students agree to participate.
The next day, the armed class storm the island, though a majority are killed by gunfire or booby traps. Led by Shiori, the class infiltrate the Wild Seven’s fort but are surrounded by the rebels, leading to a stand-off. Emotions soon run high, leading to several more deaths. Realising that the students are wearing bomb collars, Shuya orders Wild Seven technician Maki Souda to activate an EMP device, disabling and removing the collars, sparing the remaining students. The students meet Shuya, who explains that he and Norika fled to Afghanistan, finding the populace living with hope, despite suffering twenty years of warfare. Riki, who lost his daughter in the Tokyo bombing, deploys soldiers to kill Shuya. The remaining students side with the Wild Seven, killing the soldiers.
On Christmas Day, Shuya televises a live message to the world calling for the young to oppose their rulers. In retaliation, the United States strikes the island with a missile. Takuma and Haruka are buried under rubble, where the latter dies from wounds. The Japanese Prime Minister informs Riki that the United States will launch an attack on the Wild Seven in twelve hours, ordering Riki to bomb the island himself. When Riki refuses, the Prime Minister assumes command and dismisses him.
Come dawn, the Wild Seven prepare for battle, sending the students and non-combatants to safety through an escape passage, though Shiori stays behind. Takuma decides to return, joined by classmates Masami Shibaki and Osamu Kasai. In the lengthy battle, all members of the Wild Seven save Shuya are killed. Shuya, Takuma, and Shiori are met by Riki, sporting a bomb collar, who allows them to escape just as his collar explodes, timed with a pre-programmed bomb set up by the Wild Seven to destroy the fort.
The three escape the explosion and assault a swarm of soldiers. Shiori is mortally wounded in the battle, revealing her identity to Shuya, and asks about Noriko, understanding why Kitano favoured her, as she treated her father cruelly. Shuya and Takuma perform a final stand as the island is bombarded with missiles.
Three months later, Shuya and Takuma arrive in Afghanistan and reunite with the surviving students, including Noriko. The group part ways, with Shuya concluding the future is bright as long as there is hope.
