This is a book specifically for high school baseball players, created by high school baseball coaches in Chiba Prefecture. Mr. Koeda, who also served as the U18 Japan National Team manager, was involved in the editing. I happened to find and acquire this book, but I've finished reading it, so I'm putting it up for sale. - Title: High School Baseball Player Technical Instruction Manual - Language: Japanese - Target Audience: High school baseball players - Content: Information on technical instruction - Format: Book Thank you for looking.