A set sale of the "Why? How?" series. I am selling these because my child no longer reads them. There are minor scratches and some stains on the covers, but the inside is clean and in good enough condition to read. We are looking forward to orders from those who understand that these are used items. #Tetsuya Murayama #Tetsuya_Murayama #Masato Ohno #Masato_Ohno #Books #Lifestyle/Hobbies & Entertainment