Yuuichi Katagiri and his friends, Tenji Mikasa, Shiho Sawaragi, Makoto Shibe and Yutori Kokorogi, live a simple high school life. One day, their school trip fund of two million yen is stolen. Amid all sorts of suspicions, they are suddenly abducted by a mysterious figure. Yuuichi and friends wake up in a strange room and before them appears an enigmatic doll that calls itself Manabu-kun.
The five close friends are forced to play an Ouija board game where they must remain silent. Yuichi catches on to Tenji, Shiho, and Shibe's strategy and raises his voice, consequentially doubling their debt. When they arrive at the end, the game concludes with the question: "Will we stay friends forever?"
Dark secrets are exposed as the second game, Bad-Mouth Sugoroku, continues.
Tenji tries to alienate Shiho from the others so he can have her all to himself.
The friends are shocked to discover that Shibe had killed someone in the past! Shibe denies the deed and ends up in the first place. Meanwhile, Tenji is convinced Yuichi slipped the paper as an unexpected turn of events baffles him. Yuichi announces that he knows who is responsible for making them play this game.
Tenji is forced to confess that he applied to play "Tomodachi Game."
Chiaki Kobayashi
Yuichi Katagiri
Daiki Hamano
Tenji Mikasa
Yume Miyamoto
Shiho Sawaragi
Satomi Amano
Yutori Kokorogi
Reina Ueda
Maria Mizuse