This is an optional picture book for Kodomo Challenge for 1 and 2 year olds. My child preferred this book over the main set. It really suited their age, and with various types of picture books, they were reading it quite a bit until around 3 or 4 years old. There are some stains and folds on the cover, but since it was used for bedtime reading, the inside isn't very dirty and can still be read. It's an optional set, but the content is at the level of a regular picture book. It includes all 12 books from April to March. Kodomo Challenge Benesse Shimajiro Ehonbako (Picture Book Box) Optional Yomikikase Plus (Reading Aloud Plus) For 1-year-olds For 2-year-olds For toddlers Educational Picture book Reading aloud Picture book set