The gang overpowers Natsuko and reach the summit, just as they get their next order to cut their body parts to make a human doll. Ryou offers to sacrifice first so Natsuko helps him cut his leg using a chainsaw. Seeing Ryou dead, Aya tries to strangle Natsuko but Natsuko just cuts her body off with her chainsaw. With only Nobuaki, Riona, and Natsuko remaining, they finally calm down to brainstorm how to end the game once and for all. They combine the one-letter texts from the dead classmates and finally discover the truth about the King's Game: It is, in fact, an apocalyptic virus-type of game that will never end unless every player dies. If there is a survivor the virus is carried on by them and the game will continue until all of humanity is destroyed. The King's Game let Nobuaki survive his first game despite saying he would be punished because it needed a carrier. Natsuko tries to kill Nobuaki by strangling him for confirming her suspicions of false hope, but Riona attacks her with the chainsaw and fatally wounds her. With Natsuko seemingly dead, Riona begins declaring her love for Nobuaki but, using the last of her breath, Natsuko kills Nobuaki with the chainsaw, claiming she loved him first and refusing to let Riona take him. In the afterlife, Nobuaki is reunited with Chiemi and his other dead friends, who had waited for him. As the only survivor, Riona drags Nobuaki's corpse to the beach and commits suicide by drowning herself with Nobuaki's dead body.
In the epilogue, somewhere in Japan, a random student gets a text from the King, saying the King's Game has begun once again.