"Paper pages" refers to both "Naruto" that Kako read in her previous life, and also refers to the future she sorted out based on the memory of the original work; "outside the paper pages" refers to the daily life, system, pain and choices that comics have never shown, and it is also the true and complete life of those who were once regarded as "characters" by her.
Nara Shikako once knew the story of this world.
She knew that the Kyuubi would come to Konoha, that the Uchiha clan would eventually be destroyed, that Naruto would become a hero, and that Sasuke would leave his companions for revenge. So, when she became Nara Shikamaru's twin sister, she thought that as long as she remembered enough and prepared early enough, she could avoid all tragedies.
But the real ninja world is not in the comic storyboard.
The wounds here will hurt, and secrets will hurt trust; a warning given in advance may not be believed by anyone, and a rescue that you think is right may also deprive others of their choice. Naruto is not a protagonist who is destined to succeed, Sasuke is not an Avenger waiting to be persuaded back to the right path, and Shikamaru is not the scale she uses to measure "normal". They are all people who are growing up, making mistakes, and have the right to make decisions about their own lives.
From the Night of the Nine-Tails to the Storm of the Ninja World, Kako has never just had to learn ninjutsu. She must learn to admit ignorance, accept help, and move forward side by side with others in a future she cannot control - and also understand that protecting a person does not mean writing a good ending for him.
This is a story about a girl who once watched all living beings through the page, and finally stepped outside the story, living with them, making choices together, and bearing the price together.