Thank you for viewing. This is a set of 5 books from the "Why? How?" series. The condition of the items is as shown in the photos. These have been stored at home. I have checked the items, but they are used, so please refrain from purchasing if you are sensitive to this. "The Mysteries of Space: Why? How?" Hideaki Miyamoto Price: ¥950 "The Mysteries of the Mind: Why? How? Continued" Tetsuya Murayama / Masato Ohno Price: ¥900 "The Mysteries of the Mind: Why? How?" Tetsuya Murayama / Masato Ohno Price: ¥850 "The Mysteries of Society: Why? How? 1st Grade" Tetsuya Murayama Price: ¥850 "Why? How? Fun! The Mysteries of Science: 2nd Grade" Tetsuya Murayama Price: ¥800