This book proposes a solution to three interrelated problems facing Japan: the rapidly declining population, a decrease in working age adults, and a lack of social and economic vitality. Hidenori Sakanaka, the former director of the Tokyo Regional Immigration Bureau, proposes that Japan accept ten million immigrants, including refugees, over the next fifty years, and articulates the benefits of this measure for Japan and its future. The author has spent close to fifty years working in the field of immigration and was one of the first to identify the pending population crisis as early as the mid-1970s. This is the first time his thoughts appear in book-length form.