Unprecedented Immediate Reprint & Over 10,000 Copies Sold for a Practical Guide! Topping Amazon's "Accounting Professional Books" Ranking! A Highly Acclaimed Bestseller

"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 Excel Searches Improved by Generative AI Introduction

📕 Book Overview

This book is written by Keisuke Shirai, who also works as the CPA YouTuber "Kuroi." It condenses practical know-how using the latest "reasoning models (deliberative AI)," primarily focusing on Gemini.

- All prompts are downloadable: You can immediately try all the prompts introduced in the book for your work.

- Includes bonus videos: Learn practical methods through videos accessed via QR codes placed in each chapter.

- Utilization guide by company size: Clearly indicates how to use it according to your phase, from small and medium-sized enterprises to parent companies of listed corporations.

This is a book packed with practical ways to use generative AI, which will help improve the efficiency of accounting operations and reduce the workload burden on employees due to overtime.

Analog Expense Check Workflow Generative AI Introduction Expense Check Workflow

📕 Book Structure and Utilization Workflow

Chapter 1: Introduction Basics - Principles of security (opt-out) and prospects for the AI agent era.

Chapter 2: Daily Operations x Generative AI - Excel functions, VBA, and automation of invoice processing.

Chapter 3: Monthly Operations x Generative AI - Automation of payment reconciliation and analysis of increases/decreases using journals.

Chapter 4: Annual Operations x Generative AI - Researching examples from other companies (Deep Research) and creating anticipated Q&A for shareholder meetings.

Chapter 5: Other Operations x Generative AI - Meeting minutes creation, work handover manuals, performance evaluations.

Example prompt for budget vs. actual analysis and variance comment creation using Gemini

📕 Display Expanding Rapidly in Bookstores Nationwide!

Attention to this book is not limited to online bookstores; it is also selling well in physical bookstores across the country. Following strong sales immediately after release in flagship stores in central Tokyo such as Shinjuku, Marunouchi, and Umeda, the wave is now rapidly spreading to regional cities nationwide.

According to sales data from bookstores like Kinokuniya and Maruzen & Junkudo, stores in major cities from Sapporo to Naha are experiencing immediate sell-outs upon arrival or low stock. The movement to "utilize generative AI in accounting and bookkeeping practice" is now a nationwide phenomenon attracting attention regardless of region.

Maruzen Marunouchi Main Store, photographed on June 22, 2026 Kinokuniya Umeda Main Store, photographed on June 16, 2026

Author Profile

Author's Photo

Keisuke Shirai (しらい けいすけ)

Representative of Keisuke Shirai Certified Public Accountant Office. Certified Public Accountant, lecturer at CPA Kaikei Gakuin, former part-time lecturer at Kindai University Faculty of Business Administration. After passing the Certified Public Accountant examination in 2011, he engaged in audit work at Seiwa Audit Corporation, then worked in IFRS advisory and training at Shin Nihon LLC and Ernst & Young ShinNihon LLC. Subsequently, he belonged to the accounting department at Recruit Holdings Co., Ltd., where he was primarily responsible for consolidated financial reporting, disclosure document preparation, and led the first year of IFRS securities report preparation. X (@Kuroi_CPA) has 25,000 followers, and the Certified Public Accountant YouTuber Kuroi Channel has over 60,000 subscribers.

Bibliographic Information

Title: Before/After Explained: Generative AI x Accounting & Bookkeeping Practical Introduction

Author: Keisuke Shirai

Price: 2,200 yen (tax included)

Format: A5, Paperback / 292 pages

ISBN: 978-4-534-06275-8

Publisher: Nihon Jitsugyo Publishing Co., Ltd.

Nihon Jitsugyo Publishing Co., Ltd.: https://www.njg.co.jp/book/9784534062758/

Amazon: https://www.amazon.co.jp/dp/4534062753/

Rakuten Books: https://books.rakuten.co.jp/rb/18564946/