NEWS

Bengo4.com, Inc. Starts Providing Legal Brain Agent, an AI Agent Specializing in Legal Affairs, to Mizuho Bank, Ltd.

Press Release

LEGAL BRAIN

Feb 12 2026

Bengo4.com, Inc. (Minato-ku, Tokyo; Taichiro Motoe, Representative Director, President and CEO, Lawyer; hereinafter, the “Company”) announces that it starts providing Legal Brain Agent, an AI agent specializing in the legal domain, to Mizuho Bank, Ltd. (Chiyoda-ku, Tokyo; Masahiko Kato President & CEO; hereinafter, “Mizuho Bank”).


■ Project background: Promoting legal DX to meet the requirements of increasingly complex laws and regulations

The regulatory environment surrounding the financial industry is becoming more complex with each passing year, and the frequency with which new and revised laws, regulations, and guidelines appear in Japan and abroad is high and increasing. The legal departments at Mizuho Bank have also required considerable time for legal research as they handle numerous cases every day.

In particular, with the increase in projects such as starting up new businesses, alliances with other companies, and the digitization of various services, there is a growing need to respond to the requirements of regulations in unprecedented fields and new legal areas, such as intellectual property and AI-related fields in addition to traditional banking law. It has been an urgent issue to maintain the quality of legal services with limited professional personnel while providing prompt support.

Against this background, Mizuho Bank has made promoting DX in legal affairs one of its top priorities, deciding to introduce the Company’s Legal Brain Agent as a solution to improve legal research efficiency.


■ Highly valued point: Recognized response reliability and high-quality service updates

When introducing Legal Brain Agent, Mizuho Bank in particular recognized the clear grounds for the responses it provides and the continued evolution of services.

In addition to specifying books, literature, and other references in the responses, one of the deciding factors for introducing the service was the ability to seamlessly conduct in-depth research in line with practical work through linkage with Hanreihisho.

Moreover, even during the trial period, improvements were observable in a short period of time, including faster response speeds, thus giving a feel for how the service was in constant evolution. Mizuho Bank also felt hopeful about the clear roadmap for future service expansions and the development system working to improve quality while reflecting user feedback. The capacity to always provide the latest and high-quality updates in the rapidly changing field of AI has allowed the service to be used with peace of mind. Encouraged by this positive evaluation, Bengo4.com will keep striving to further improve and evolve its service to be suitable for practical work.


■ Comments regarding the introduction

Yuji Inagaki, Head of Product of the Legal Brain Business Division, Bengo4.com, Inc.

“We are honored to have Mizuho Bank introduce Legal Brain Agent. The legal departments of financial institutions are responsible for exceedingly important and complex work, including responses to an ever-changing regulatory environment. Legal Brain Agent was developed to allow users to spend more time on decision-making and strategic legal support, which are the core tasks. By combining knowledge and data in the legal domain that we have accumulated thus far with the latest AI technology, we aim for it to be an AI agent that meets the needs of legal experts. We will keep striving to expand functions and improve service quality to better contribute to the promotion of legal DX at Mizuho Bank.”


■ About Legal Brain Agent

Legal Brain Agent is an AI agent specialized in legal affairs that is equipped with the Legal Brain legal-specialized AI platform developed exclusively by the Company. It understands the user’s research intention through natural language input, clearly indicates links to the sources (*1) that are used to produce the answer, automatically extracts legal issues, and presents them in an easy-to-understand bullet-points format. It considerably reduces complex, time-consuming, and labor-intensive research tasks, helping to create an environment where lawyers, legal staff, and other professionals can concentrate on more value-added work.

*1: Relevant laws and regulations, precedents, technical books, guidelines, etc.

URL of the website for the service: https://legalbrain.com/


Contact for inquiries

Corporate Communications, Bengo4.com, Inc.

Kurosaki Bldg. 4-1-4 Roppongi, Minato-ku, Tokyo, 106-0032

TEL +81-3-5549-2555 E-Mail info-press@bengo4.com