This book discusses the sovereignty over the Diaoyu Islands from the perspectives of Ryukyu and Okinawa. Written in chronological order, the book has 13 chapters featuring 121 documents and maps. The first 12 chapters explain, based on detailed historical facts on the Diaoyu Islands, the rise and decline of the Ryukyu Kingdom and the historical roles of China, Japan, and the United States in the history of the kingdom. The final chapter is an overview of the Sino-Ryukyuan, Japan-Ryukyuan and US-Ryukyuan relations, and further clarifies the issue of ownership of the Diaoyu Islands and their strategic position. The book demonstrates that Ryukyu did not have sovereignty over the Diaoyu Islands, refutes Japan's claim that these islands were a part of the Ryukyu Kingdom, and reveals the causes and consequences of the Sino-Japanese conflicts created by the United States. The book examines the 500-year friendship between China and Ryukyu, recounting moving stories. Lastly, citing ancient documents and more, the books proves that the Ryukyus never owned the Diaoyu Islands and that these islands belong to China.