I Save the World by Wearing Books

One-sentence synopsis: Awakening her powers and traveling to other worlds, she saves this world on the verge of destruction by traveling through books. (No slicing, no precise separation) Normal version summary: She lived with her younger brother in the apocalypse for five years. Just when she couldn't support it any longer, she gained the ability to pass through books and bring back materials from another world. She thought that she could probably survive with her brother and save the world along the way. However, the task of saving the world should be handed over to the state. It is already difficult to earn a lot of merit every time you wear a book.