“The Way of Letting Go: 90% Discarding” is a PRESIDENT MOOK from the Cutting Edge of Knowledge series, published by President Inc. in its first printing in September 2025. 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 business leader Zenju Nakano, who imparts "The Way of Letting Go," and as someone who has actually put letting go into practice, he is quite persuasive. "Spring Night's Ten Talks" is a Kobunsha Bunko book by Kiyoshi Oka, first published in November 2006, second printing. 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 its first printing in August 2025. He is a mystery writer, popular for his sharp and intellectual style, but he also presents and practices his unique way of life and thinking in his essays. It is a book that 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.