Seven students from Class 1-B have been abducted by an unknown party and awaken on the 5th floor of a pitch-black, windowless abandoned building. Their Quirks have been completely suppressed, rendering them powerless humans. Digital timers emitting an eerie red glow are installed throughout the walls, maintaining a silent countdown. To escape, they must navigate through darkness and traps to reach the 1st floor.

Each person is provided with a backpack containing emergency rations, first-aid supplies, various survival gear, and a mysterious piece of white synthetic paper (Yupo paper). Flashlights are provided, but their combined battery life is designed to run out before reaching the 1st floor. The path is rigged with lethal pitfalls and landmines. While lights are necessary to spot traps, keeping them on makes the traps more vicious on lower floors, requiring extreme risk management as batteries drain.

On the 2nd floor, near the goal, the static traps are replaced by large, trained beasts (wolf-like monsters) that prowl the area to hunt and kill the players. Since the beasts are weak to light, whether or not the players saved their batteries determines their survival. (Motif: Beast of Gévaudan)

Upon reaching the 1st floor, they find an iron door leading outside, a monitor, and small rooms on both sides (7 rooms in total). Once each survivor enters a room, they are locked in, and a wolf mascot on the monitor announces the final trial. The Trial: Write the name of the person who "contributed the least to clearing the game (the most useless)" on the paper and vote by sliding it through a gap. The person with the most votes will be executed. The provided white paper must be used. Those who lost theirs can use paper from the desk drawer, but in the event of a tie, votes written on the original provided paper take priority. Not voting, leaving it blank, illegible writing, or writing the name of someone not present will be treated as a vote for oneself. The time limit is 15 minutes. Once the results are finalized, lethal gas is pumped into the winner's room, resulting in death within five minutes. After the execution, the remaining rooms and the exit door are unlocked for escape.