Aru Jikken Ichi Nin Erabeto Sensei Ga Itta (Tokuma Bunko)

[Machine Translation] "The details of a psychological experiment conducted 20 years ago at the S University Sociology Department must be made public by 24:00 today. If they are not made public by the end of the date, I will be killed." A letter was sent to the police. The sender is the son of the professor who conducted the experiment. According to the subject, the experiment was nothing more than selecting one person out of 16... What was the meaning of the experiment? What was the purpose of the kidnappers? There are only 4 hours left until the date changes.

“20年前にS大社会学部で行われた心理学実験の詳細を、今日の24時までに公開すること。日付が変わった時点で公開されなければ、ぼくは殺されます”警察に手紙が届いた。差出人は実験を行なった教授の息子。被験者によればその実験は、16人から1人を選ぶだけの他愛もない内容のようだが...。実験の意味は何だったのか。誘拐犯の目的は。日付が変わるまで、残り4時間。