I used "Yusuke Nakamura's Statement of Purpose and Self-Recommendation Letter: 90% Success Rate in the Last 30 Days" by Yusuke Nakamura quite a bit. Because of this, the cover is tattered, so I will send only the obi (sleeve) and the main body. It was very helpful, so I hope those who don't mind not having the cover will purchase it on another occasion. The book on the right side also helped me to be flexible by comparing it with this one, as I felt my thinking would become rigid if I only read one book. I was able to learn new ways of rephrasing words from this book, which was helpful.