This is a set of three books: "Management: Tasks, Responsibilities, Practices: Essentials" by Peter F. Drucker, "What If the Female Manager of a High School Baseball Team Read Drucker's 'Management'?" by Natsumi Iwasaki, and "Who Moved My Cheese?". **"Management: Tasks, Responsibilities, Practices: Essentials"** This is a classic of management theory by Drucker, known as the father of modern management. It's a very helpful book for learning the basics of business. **"What If the Female Manager of a High School Baseball Team Read Drucker's 'Management'?"** Commonly known as "Moshidora." This book features a unique setting where a high school baseball team manager applies Drucker's theories, making it easy to read even for those who aren't fond of business books. It was also adapted into an anime and is a popular work. **"Who Moved My Cheese?"** "Who Moved My Cheese?" is a parable that tells the story of "two mice" and "two little people" living in a maze, searching for cheese, and how they deal with change. When a large amount of cheese suddenly disappears, the story contrasts those who immediately start looking for new cheese with those who get stuck dwelling on why the cheese is gone, simply conveying the importance of "not being afraid of change and acting quickly." All three books are recommended for those interested in business and self-improvement. There are no noticeable scratches or stains, and they are in relatively good condition, but there is a small amount of writing in the "Management" book. Therefore, they are offered at a reduced price. Thank you.