Welcome to White Rabbit Japan!
10-pun de Yomeru Monogatari - 4th Grade is part of a series of books by Gakken aimed at Japanese 4th graders, typically children aged about 9 years old. The book contains 13 stories appropriate for children - and language learners at around the JLPT N3 level! While not originally meant for foreigners who learn Japanese, this book (and series) let's you experience authentic Japanese, and helps you retain grammar and words you already know while also adding words and kanji you don't know to the mix. If you want a change of pace from your textbook and experience real Japanese, this book is your best bet.