The book is: The ultimate book for book lovers, by an Akutagawa Prize winner and a popular picture book artist.

　▍They set off.
　　▍On a never-ending journey to find "that book"...

　　There once was a king who loved books.
　　The king was old and his eyesight was almost gone.
　　So, he summoned two men to the palace and said to them:

　　"I love books. I have read countless books in my life,
　　I have read almost every book in the world.
　　However, my eyesight is getting worse, and I can no longer read.
　　But I still love books, so I want to hear stories about books.
　　Go all over the world,
　　Find people who know about various 'curious books',
　　Then ask them what kind of 'curious book' it is,
　　And when you return, tell me the story of that book."

　　The two men embarked on a journey to find books,
　　And brought back many stories about books,
　　Taking turns telling them to the king every night:
　　"That person said, that book..."

　　----------⚐----------

　　♕ That Book Is──The Akutagawa Prize winner and popular picture book author, a super dream team!

　　See how Naoki Matayoshi, the author and comedian who won the Akutagawa Prize with "Spark," and Shinsuke Yoshitake, the picture book author whose works have won countless awards and are loved by both adults and children, co-wrote "That Book Is," a book that lets readers explore a vast collection of books, using "books" as their theme!

　　♕ That Book Is──The ultimate book dedicated to all book lovers!

　　That book, after removing its dust jacket, has an inner binding that is so elaborate it feels a bit extravagant.
　　That book, though only one volume, contains world-building settings that could fill several books.<
　　That book, though just bought, already has pages so yellowed it smells like an ancient tome.
　　That book, makes you laugh and cry, making it hard to control your emotions.
　　That book, mercilessly wounds your heart when you're not paying attention.
　　That book, subverts the fundamental concept of a book, questioning the meaning of its existence.
　　That book, once you read it, you will remember it for a lifetime.
　　That book, ______________________________________________

　　♕ That Book Is──It will make you remember "that book" in your heart too!

　　"That book was torn to shreds by my one-year-old son. But I always feel that perhaps the current state of this book is the true state of the world."
　　"That book, one day, can save me. One day, it can bring me some kind of opportunity. Although I haven't read that book yet, I have already bought it and brought it home. One day I will read that book."
　　"That book was very kind and gentle. After the monster ate the kind and gentle book, it also became a kind and gentle monster."
　　"That book, like a comrade-in-arms who walked with me through hell, was written specifically for me.
　　
Recommended by Celebrities

　　♕ That Book Is──Highly recommended by book lovers from all fields!

　　[Laughing and Crying Community Manager] Editor B, [Japanese Translator] Wang Yun-chieh, [Writer, Danfeng High School Library Director] Song Yi-hui, [Translator and Reading Promoter] Lee Jane-huei, [Lin Bo-ting's Illustration Picture Book] Lin Bo-ting, [Author of "Time Laundry," Counseling Psychologist] Heidi (Lee Chia-wen), [Heidi's son, struggling with exams but can't miss a good book] Heidi's son, [Children's Picture Book Illustrator] Chang Hsiao-chi, [Writer] Chang Wei-chung, [Counseling Psychologist, Bestselling Author] Chen Chih-heng, [Writer] Peng Shu-chun, [Poet Director] Lu Chien-chang, [Writer] Chen Shu-ting, [Eslite Bookstore Store Manager] Hsin-ju, [Kingstone Literature Museum Director] Busy Mango, [Qing Geng Yu Du Little Bookstore] Owner, [A Bookstore] Clerk C, [National Chengchi University Bookstore Tainan Branch Clerk] Panda, [Books.com.tw Planner] Lo Tzu-hsun, [IG Reading Account] Vivi., [IG Reading Influencer] Weean, [IG Reading Account] Why Not Reading, [Book Lover] Flower of Books, [IG Reading Account] Picky Bookworm Zai Zai, [IG Reading Account] Ms. Snake Turtle, [Picture Book Diary Influencer] Kuo Fu, [IG Reading Account] Frog 🐸 Book Explorer, ["Picture Book Planet 212-7" Influencer] Lan Yi-chin (See trial for short recommendations)