A Crowd of Three tells the story of two men, Kenta & Jun, who grew up as almost brothers at a children's facility. Kenta & Jun now works as part of a demolition crew but become fed up with their jobs. The friends then decide to take a road trip up north to visit Kenta's brother at the Abashiri prison.
A young woman named Miyuki returns to her hometown, camera in hand, after a difficult breakup. As she walks and takes photographs, she meets a variety of people and begins to realize she doesn’t have to go through this painful time in her life all alone.
For Fujiwara, everything seems to be going well - he is doing well in high school, he is good looking and also a good fighter. One day, he is suddenly attacked by a group of students without any provocation. He then discovers that there is a mysterious violent game being played out in the corridors and playfrounds of Tokyo’s high schools. The game is being spread virally via the students’ mobile phones! The victims are mysteriously hypnotized and become senseless killing machines. Fujiwara must fight for his survival and to discover the game’s terrifying secret.