Mistakes were made

Katy didn't think it through when she made the rules. As she was remembering all the things in her new life, she noticed really late that she was forgetting her old life. She wasn't immune to the power of the book, so her life was becoming the one she was supposed to have in this world. Which meant that she was forgetting, not only her family memories, but also her master in mathematics and even her ability to write and read.

Quickly, in panic, she opened the rulebook and started a new rule.

New rule : Katy Lura remamber err ol laif.

As she was writing the rule, she was forgetting how to write even simple words and by the end of it, she couldn't even read her own sentence. She closed the book, hoping that the item would understand what she wanted.