Illustrated Guide: Understanding the Mind and Behavior "Understanding Developmental Disabilities" Supervised by Hideshi Yukumi Price: ¥900 Illustrated: So Interesting You Won't Be Able to Sleep "Understanding Genetics" Supervised by Toshiyasu Ando Price: ¥900 After reading, I stored them on the bookshelf. The covers have some wrinkles, but otherwise, they are clean with no scratches or stains. Selling as a set of 2 books. No pets, no smoking.