Sumo: A History by Minute Help Guides provides a simple, English language overview of Sumo, a brief history of Sumo including snippets of most of the Champions over the last century, a day in the life of a Sumo wrestler, and touches on some of the Sumo scandals from 2007 through 2011.
This book does not take long to read so is a perfect introduction for someone wanting to gain a high level understanding of Sumo without committing to a much longer read.
This paperback has 64 pages. It was originally published March, 2012. It is 8" high by 5" wide.