"The Way of Letting Go 90%" is a PRESIDENT MOOK from the Cutting Edge of Knowledge series, published by President Inc. in September 2025, first edition. Subtitled "Why Letting Go Makes You Rich," this special magazine explores why you can become richer by letting go of everything: money, work, family, friends, health, and more. The opening article is by the legendary businessman Zenju Nakano, who teaches "The Way of Letting Go," and as someone who has actually put letting go into practice, he is quite persuasive. "Shunsho Juwa" is a Kobunsha Bunko book by Kiyoshi Oka, first published in November 2006, second edition. The author was a mathematics researcher, but he left behind many essays, and this book won the Mainichi Publishing Culture Award in 1963. He explained that mathematics is one form of artistic creation that expresses one's emotions outwardly, and he was a scholar who valued following nature. "Living and Thinking Quietly" is a book by Hiroshi Mori, published by KK Best Sellers in August 2025, first edition. He is a mystery writer, popular for his intelligent and sharp style, but he also presents and practices his unique way of life and thinking in his essays. This book quietly speaks to modern people, who tend to be swayed by things and entanglements, about what is truly important. These three books teach that life can change by letting go of attachments to people, things, and money, and by changing your way of thinking. The three books in the set are all in beautiful condition, without wrinkles, scratches, or stains.