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One question. Seven worlds. In an unidentified space, among participants suspicious of one another, a woman wearing the number tag "4235" steps into an interview chamber. Waiting for her are an unsettling interviewer and a mysterious black spherical device. With the question, "What are you most afraid of?", she is thrown into worlds of deep oceans, collapsing airplanes, ruined cities, frozen wastelands, and hell-like realms, where she confronts buried memories, guilt, and the darkest corners of human nature. As participants begin disappearing one by one, she realizes that the interview is not a simple test, but a massive experiment designed to examine the boundaries of human nature and existence itself.