Children's educational reference book, Aichi Discovery Series Volume 4. - Title: Aichi Discovery: What's This?! 4 - Series: Aichi Discovery - Volume: 4 - Cover Design: Illustrated with a blue background - Content: Educational reference book - Target age: Children Thank you for viewing. There are traces of ballpoint pen marks on the back cover. There's a trace on the suit of the man in the suit, and a blue ballpoint pen mark under the cat's tail.