A strange mask was attached to their faces, and Morihito, Kanshi, Keigo, and Miharu were transported to an unknown room while they were sleeping. The monitor in the room suddenly turns on and says, "My name is Zigzag. Play a game with me." A strange mask, a deep voice-changed voice, and orders from beyond the monitor. They were trapped in a death game, and Nico was a hostage.

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