This book, with a track record of over 900,000 copies sold, serves as a textbook for adults, specifically focusing on countermeasures against "idiots." The book has been cut (裁断済み), so it is listed as having scratches and stains. Due to the cutting, it is difficult to hold and read. "Cut" (裁断済) means the book has been prepared for scanning and conversion to PDF format. If you do not understand the meaning of "cut," please refrain from purchasing. Also, due to the nature of cut items, returns are not accepted after purchase. The condition of the item is listed as having scratches and stains due to the cutting. Please be aware that as a characteristic of cut items, there may be page folds, bends, tape, tears, or page misplacements. For sets of multiple books, some covers may be cut while others are not. In addition, please confirm the condition in the photos and purchase with your understanding. While I will send a shipping notification, I often omit thank-you messages at the time of purchase. Packaging will be done using recycled materials, primarily after placing the item in a plastic bag. - For purchases of 2 or more items, please use the "bundle request" feature. - When negotiating prices, please clearly state your desired amount. I will delete and block inquiries that simply ask "Is it cheaper?" or "Can you lower the price?" as they have not resulted in purchases. - I will block comments that are outside of common sense, such as those with significant price negotiation requests or those that do not receive a response.