Shoubu Ron: Umehara no Ryuugi is now open for preorder at Amazon Japan and some other stores.
Shoubu Ron: Umehara no Ryuugi or Match Theory: Umehara Style is Daigo Umehara's second book that will come after Willpower to Keep Winning. It will again be published by Shougakukan. The 256-page book will be released on October 1.
From the book description, the contents will focus on the philosophy of competition. It will go deeper into the subject than the first book.
Note that while Willpower to Keep Winning appears to tell story of a person, this book looks more like a work of a famous person.
Willpower to Keep Winning has sold 50,000 copies as of May 19. It reached top 3 bestselling books at launch and was one of the best selling pocket books in 2012 on Amazon Japan and also has an E-book version.