Are you a good kid? Or a naughty kid?Elementary school classmates gather for a reunion. What comes out of a time capsule is a yearbook with six faces blacked out. And so the suspicious deaths of classmates begin. Who is responsible, and why?Two classmates take action to stop the crimes. But they too harbor secrets... The suspect is a classmate. Who is the real culprit?A nonstop mystery that will keep you thinking.(Source: Japanese = NTV || Translation = MyDramaList)