"I'm afraid of making mistakes with numbers" - A practical guide addressing this urgent anxiety in accounting departments is achieving an unprecedented hit. The new book "Before/After Explained: Generative AI x Accounting & Bookkeeping Practical Introduction" (authored by Keisuke Shirai), published by Nihon Jitsugyo Publishing Co., Ltd. (Shinjuku, Tokyo; President: Junichi Sugimoto) on June 12, 2026, was immediately reprinted after its release and has sold over 10,000 copies cumulatively. Furthermore, it ranked #1 in the "Accounting Professional Books" category on Amazon from June 15 to 21. It has continued to maintain its bestseller status, with its know-how on dramatically transforming accounting operations using generative AI receiving an overwhelming response from many practical professionals. Image of the cover of "Before/After Explained: Generative AI x Accounting & Bookkeeping Practical Introduction" Why is "Generative AI Utilization in Accounting" in Demand Now? Currently, many accounting departments harbor deep-seated anxieties and questions regarding the introduction of generative AI, such as "I'm worried about security" and "I don't know what it can be used for." However, as the way the world works undergoes drastic changes, the "risk of not using" generative AI is becoming greater. There are three noteworthy points behind this book's exceptional success: 1 Practical Solutions Tailored to a Field Where "Accuracy is Paramount": Acknowledging the risk of hallucination (plausible falsehoods), it proposes a form of "collaboration" that incorporates human checks. 2 Overwhelming Visualization of "Before → After": It contrasts analog workflow challenges in "Before" with improvements through generative AI in "After," presenting a concrete image of the post-implementation state. 3 Clear Distinction from DX (Systemization): It advocates for "true utilization techniques" by layering AI as an engine on top of the foundation of systemization. Losses Occurring with Exc