The product is a set of four art books by illustrator Shirow Masamune featuring the "W・TAILS CAT" franchise. The art books were manufactured in 2013 and are in Japanese language. The books have a multicolor design and are made of paper, with an interactive feature. The brand behind the art books is GOT Corporation, and they were originally released at the Nor Con convention event. This set includes volumes 2, 3, 4, and a rough book, making it a comprehensive collection for fans of angels and unique artwork.