Yoichi Hiruma's book of information to blackmail everyone from students to figures of authority into placing him in a position of power. In one of Q&A column, it is revealed that the book was actually blank- All the information lies within Hiruma's brain, and the book only serves as a threat tool. It was revealed in a flash back in chapter 250 that the notebook was created to blackmail the vice principal into allowing the American football club to be made. Most of the book's information is gathered by cameras in cellphones. Additionally Agon Kongo was used as hired muscle with the promise of hot girls.