This book is an insider’s account of the problems facing the Self-Defense Forces (SDF), Japan’s postwar military, authored by the country’s leading submariner, Hideki Nakamura. Specializing in the submarine fleet, he became an ace commander, in addition to serving as an analyst and professor in security studies. During his career, he became increasingly troubled by the SDF’s ability to fight due to legal, political, and operational restrictions placed upon it. This book, a translation of his 2017 bestseller, is a must-read for those interested in Japan’s military and its ability to partner with other countries.