This book is a unique collection of early documents and research on Usui Mikao's Reiki therapy, compiled by Olaf Böhm during his numerous journeys to Japan. For the first time, this work publishes, in its entirety, some writings of the early Usui Reiki Ryoho Gakkai, the Reiki community founded by Usui Mikao Sensei in 1922. It also presents some very interesting views about Japan and its psycho-spiritual methods from a hundred years ago, as well as insights into lifetime of Usui Mikao. The book aims to contribute to a deeper understanding of the history of Reiki and to provide insight into the beginnings of Reiki therapy in the 1920s and 1930s. It is intended for Reiki practitioners from all lineages, as well as those who want to learn more about Reiki history. This book is a must-have in every good Reiki library.