The notebook that's been checked into the library is orange, the same run of the mill team notebook that's provided in the backpack upon arrival. Opening the book would find a simple notation that these are the notes of Senku Ishigami, Orange Team.
This notebook contains data gathered, as well as the thoughts and opinions of the author.
The Notes of Senku Ishigami
This notebook contains data gathered, as well as the thoughts and opinions of the author.