Are you a good person or a bad person? Elementary schoolmates gather for a reunion. A graduation yearbook with six faces blacked out is unearthed from a time capsule. Suddenly, the suspicious deaths of classmates begin. Who is responsible, and for what purpose? Two of them start to investigate in an attempt to stop the incidents, but they also have secrets of their own… Classmates who are now suspects—will the real culprit be revealed? An unpredictable, thought-provoking mystery begins.