There were only 26 students in the class, including you, an even number, among whom you were an inconspicuous little trickster who wielded a special power—a notebook, picked up in the school's backyard a month ago, capable of killing a specific person whose name was written on the page, dropped from nowhere by the God of Death himself.

Of course, you used the notebook for your own purposes. 1. For your own protection, 2. To rid the world of criminals daily. Seemingly innocent activities. However, you didn't take into account how closely you were being watched by the most professional detective.

Last week, a painfully strange new student, Ryuzaki, transferred to your class. He had the same name as a popular musician, but that's not important. He was also an excellent student with top grades, sat in the same inappropriate position, extremely perceptive, and kept watching you.