A private high school in a typical regional city. One morning, all students are gathered in the gymnasium without explanation. Then, a mechanical announcement blares from the ceiling speakers. "The 'Survival Selection Class' will now begin. Only the last one remaining will be allowed to graduate." The gym doors are locked, and the windows are covered by black shutters. Every smartphone is forcibly connected to a mysterious app that cannot be uninstalled. The app displays the following: Every student is assigned a unique ability, a limitation, and an activation condition. Rules of Engagement (Official) No weapons will be provided. Direct killing is prohibited... or so it says. However, Cornering others, Preventing them from meeting their conditions, And committing "violence" Are "not included in prohibited acts." In other words, It is a battle of wits and murder. The Students' Transformation At first, they try to cooperate. But a few days later, dropouts begin to appear. The class president, driven by a strong sense of justice, is targeted first for trying to protect everyone. Unremarkable students begin to operate in the shadows, exploiting loopholes in the conditions. Best friends become enemies. Someone realizes: "You can't win this game without knowing their personalities and pasts." To survive, You must constantly choose whether to trust, doubt, or discard others. The survival battle set in a school begins.