Now, what kind of guy are you?

A High Schooler

Your name is John Doe, and you're a normal high schooler, at least until ten minutes ago. At least until you find the book. Now, you're hard at thinking of what to do next. But before that, you quickly open the book and write into it.

"Old rule. 1. The Rulebook belongs to John Doe. 2. Only John Doe can write rules into the Rulebook and has the rules become effective. 3. Only John Doe can erase the rules writen here. 4. The rulebook will teleport itself into the hand of the John Doe whenever the distance between the two is more than 20 feet."

You quickly pay for the coffee and exit. Once outside, you put the book on the ground and cautiously walk away, until you feel your hand suddenly holding something. You look at the Rulebook at your hand and then at the place where you left it. At least that seems to work.

Time to go to school, then.