One of the things I appreciate most is the combination of natural, level-appropriate Japanese, beautiful illustrations, and real-life photos. The visual support makes it much easier to understand new vocabulary and follow the stories without feeling overwhelmed.
These books are an excellent resource for developing reading comprehension, expanding vocabulary, and encouraging students to read independently. As both a former Japanese language learner and a Japanese language teacher, I highly recommend this reading series for N5 and N4 learners.