Very good state of the book !
Yobidashi are one of the types of behind-the-scenes people in sumo. Their three main duties are calling out, constructing the dohyo, and drumming (taiko). They are also charged with sweeping the dohyo, sounding wooden clappers, and carrying prize banners around the dohyo, among other tasks.
This book was written by a Sumo insider, Hideo Yamaki, who rose to the top rank of the Yobidashi. Originally written in Japanese and translated to English by Clyde Newton. It provides a wonderful insight into the workings of Japanese Sumo from the perspective of one who knows wrestlers, referees, stable owners, and the Japan Sumo Association.

This book is a wonderful guide for anyone interested in learning about Japanese Sumo. Topics include the role and duties of the yobidashi (building the dohyo, announcing wrestlers, drumming, sweeping, and much more), role of the referee, life of a wrestler, how sumo is organized and operated, and much, much more. The book includes a number of illustrations with my favorite being the layout of the dohyo on the back of the jacket.

This hardback has 170 pages and a 12 page glossary. It was originally released January, 2017. It is 7.25" high by 5.25" wide (small book).