Please check the photos for the five books. I flipped through them, and they are mostly clean. However, in "100 Piki no Tsuna Hiki" (100 Frogs Tug-of-War), there's a mark on the spread where you open the book to see a pop-up or interactive element. I've included photos (though it might be hard to see). My son loves insects, and he's read this book a few times, so it has more wear than the others. The pages other than the spread are clean. A fun picture book set featuring various characters. - Title: Tomodachi Pass - Title: 100 Piki no Kaeru (100 Frogs) - Title: Orai-on-san - Title: Sanzo Hoshi no Kaeri - Title: Tondemo Penguin Thank you for looking.