"laws and regulations" x "Digital" Hackathon

"From December 9, 2025 (Tue) to March 10, 2026 (Tue), the" "laws and regulations" "x" "Digital" "Hackathon (hereinafter referred to as the" "Hackathon" ") was held. For information on the event program, etc., which was publicly available at the time of recruitment of participants, please visit " "laws and regulations" "x" "Digital" "Hackathon ."

Table of Contents

• 1. Overview
• 2. Event Details
• 3. Introduction of works
  • Award-winning works
    • Grand Prize
    • Excellence Award
    • Category Award
  • Other Works
• 4. Related Information

1. Overview

"laws and regulations" × "Digital" hackathons were held to improve the efficiency of legislative affairs, provide easy-to-understand laws and regulations information to citizens, and create new businesses utilizing laws and regulations information.
On the first day of the hackathon on December 9 (Tue), Digital Agency introduced "laws and regulations" and "digital" initiatives, and a workshop was held where Digital Agency officials (including administrative officials, lawyers, and engineers) and participants came up with ideas and brushed up the development content together.
A total of 112 people participated in the hackathon, which was a short-term intensive development for about one and a half months, and 20 teams submitted works. The top 10 teams were selected as finalists and announced on March 10 (Tue).

Judge

• Kohei Kuno: Planning Section Chief, General Affairs Division, Ministry of Health, Labor and Welfare Pension Bureau
• Yukiyoshi Kojima: Representative Attorney, Kojima Sogo Law Office (Visiting Professor, Waseda University Law School)
• Tatsuki Yagita: CEO of Legalscape, Inc.
• Kenichi Yoneda: Director of Kagoshima University's Center for Justice Policy Education and Research

Award Results

Finalists (excluding winning teams)

2. Event Details

[Day 1]

• Date: December 9, 2025 (Tue)
• Venue: Hybrid format of face-to-face venue and online venue

First, Prime Minister Digital Agency explained the "laws and regulations × Digital" initiatives.
There is an affinity between "laws and regulations" and "Program" in terms of the strict description of rules and procedures. In other countries, efforts called "Rules as Code" (RaC) (describing laws and regulations in a machine-executable format (program) to facilitate simulations of policy effects and system implementation of legal systems) are being studied. Based on this background, Digital Agency explained its efforts to improve the efficiency of legal affairs using digital technology and to provide easy-to-understand data on laws and regulations, etc.
In addition, Polimill Co., Ltd., which has been entrusted by Digital Agency with the technical verification project on the use of generative AI in legal affairs in fiscal 2025, shared the legal affairs support tools that are currently being verified. In addition, an explanation was given on the new function of Digital Agency APIs and MCPs, which laws and regulations will provide on a trial basis to participants of this hackathon.

After that, a workshop was held to come up with ideas and brush up on the work to be developed.
Officials from Digital Agency, such as administrators, lawyers, and system engineers, each with a different background, went around the tables of each team and discussed the participants' development ideas.

The Digital Agency staff and the participants had a lively discussion on the needs of the legal system in the field and issues for realizing the ideas of the participants, and many ideas were generated.

[Day 2]

• Date: Wednesday, December 17, 2025
• Format: Online

Digital Agency officials and others conducted online interviews with teams of their choice, providing feedback on the ideas participants were developing from their legal and legal experience, as well as advice on technical aspects.

[Day 3]

• Date: March 10, 2026 (Tue)
• Venue: Hybrid format of face-to-face venue and online venue

Each team developed a work after about a month and a half of development, a preliminary screening was conducted by the judges, and the top 10 teams presented their works.
Parliamentary Vice-Minister for Digital Transformation Kawasaki also attended the presentation, and along with encouraging the finalists prior to the start, he stated that he was pleased that the participants faced laws and regulations and shared their ideas for the formation of a digital society.

Each team made a presentation on the work they had developed, and after the presentation, the judges, Mr. Kuno, Mr. Kojima, Mr. Yagita, and Mr. Yoneda, made comments and had a question and answer session with the presenters.

Mr. Minister for Digital Transformation Matumoto also attended the award ceremony. In his opening remarks, Mr. Minister for Digital Transformation Matumoto expressed his gratitude for the participation of participants with diverse backgrounds, and stated that he would like to utilize the excellent ideas presented at this hackathon for laws and regulations's efforts to improve the convenience of Digital Agency Databank, and asked for continued support for Digital Agency.

After that, the results of the Grand Prize, Excellence Prize, and Division Prize (Legal Affairs Efficiency Award, laws and regulations, etc. Data Provision Award, laws and regulations, etc. Data Utilization Award) were announced, and the judges commented on the reasons for winning.

3. Introduction of works

Points of Attention Regarding Works

• Neither Digital Agency nor the judges make any guarantee as to the performances, qualities, etc. of the developed products, deliverables, etc. developed by participants.
• Digital Agency does not authorize, publish, or distribute services completed through this project as official services.
• The introduction and images of the works are excerpts from the materials submitted by the participating teams.

Award-winning works

Grand Prize

• Title: Lawsy Alerts
• Team Name: Lawsy

(Screen image of the development of the work (excerpt from the work description material submitted by the team))

• Overview of the work
  • The laws and regulations Revision Intelligence Engine converts the laws and regulations Revision into information that is directly linked to decisions and actions and provides it on a daily basis for practitioners involved in responding to the laws and regulations Revision in companies and governments.
• Value created for society
  • The laws and regulations revision information is huge and dispersed, and it takes time to confirm all the sentences, so understanding and response in the field are delayed, and policies and systems do not make sufficient function.
  • In addition, by adopting a structure that can be traced back to the primary information without fail, companies will be able to reduce their laws and regulations response costs and improve their understanding of the system, which will spread to the whole society.
• Novelty, etc.
  • This work is an innovative work in that it automatically generates an information unit that can be judged and acted on by laterally integrating legislative background, deliberation materials, guidelines, etc., from differential analysis of old and new provisions, starting from data such as e-Gov laws and regulations. In addition, transparency and verifiability are secured by publishing it as OSS.
  • Utilizing legal information capture and structuring logic and laws and regulations technology designed based on expertise in generative AI amendments, and utilizing laws and regulations APIs, etc. for function in detecting laws and regulations amendments, differential analysis of old and new articles, determination of amendment types, and generation of reports and visual images.
• Auditor Comments
  • The LLM is expected to further improve its completeness by differentiating it from the general-purpose LLM and ensuring consistency with materials officially provided by administrative agencies.
  • The information on laws and regulations revisions, which is difficult to understand despite being relevant to all citizens, is summarized using digital technology and displayed in an easy-to-understand UI / UX, making the service truly user-friendly.

Excellence Award

• Product Name: Examination Requirements Model Collaborative Creation Platform
• Team Name: bSJ

(Screen image of the development of the work (excerpt from the work description material submitted by the team))

• Overview of the work
  • For examination organizations, related organizations, consultants / vendors, and businesses that develop examination systems, the laws and regulations (Rules as Code) developed by the legal DX is converted into specifications (JSON) that can be implemented in application examination. This work provides a platform that enables collaborative creation among related parties by automatically generating an examination requirement model (conformity examination function structure, conformity determination flow).
• Value created for society
  • Currently, in the application review DX, requirements definition and specification formulation necessary for the development of the review program are dependent on individuals, and there is an issue that cross-field reuse and private implementation are difficult to advance.
  • This work will make it possible to organize and share examination requirements based on the laws and regulations database and accelerate the formulation of specifications. At the same time, it will enable the creation of examination support services and design AI agents by the private sector.
• Novelty, etc.
  • This work is an innovative work in that Rules as Code is automatically generated as "Specification that can be implemented (JSON)", consensus formation, review, and version management can be handled integrally on the co-creation platform, and that the generated specification can be directly used for private services.
• Auditor Comments
  • The content is particularly necessary for the government in the construction field. We are impressed that it incorporates a path to grow the unfinished part as a platform while incorporating the energy of the government and the private sector.
  • A work that can be used in any field that involves judging and has very wide possibilities for horizontal development.

Category Award

Legal Affairs Efficiency Award

• Title: laws and regulations Interpretation Support Agent (LawAgent)
• Team Name: Digital Ohana

(Screen image of the development of the work (excerpt from the work description material submitted by the team))

• Overview of the work
  • Laws and regulations interpretation query A work that supports young employees of the corresponding central government ministries and agencies. It cross-researches laws and regulations, the Web, laws and regulations interpretation memos, and past answers from Slack, and automatically generates highly accurate answer proposals based on syllogism.
• Value created for society
  • At present, in the work of responding to inquiries about laws and regulations interpretation, there is a challenge that the work is analog and heavy load for correct and consistent answering responsibility.
  • This work creates an environment in which you can devote your passion to "policy making," which is your original mission.
  • In addition, the personalized "organizational wisdom" will be converted into automatic knowledge. A sustainable administrative system will be built, and work productivity will be greatly improved.
• Novelty, etc.
  • Build a AI agent that can interpret and converse with input from Slack using LangGraph and respond flexibly.
  • Mashup laws and regulations research tool "Lawsy" with "laws and regulations interpretation memo" and "past answers".
  • No learning cost, just talk to LawAgent on Slack.
• Auditor Comments
  • The accumulation of knowledge is highly effective in terms of reducing the burden on busy young staff.
  • Since the knowledge of the past is a prerequisite for considering changes to the system in line with the times, it is meaningful that the knowledge necessary for considering the future is readily available.

Laws and regulations Data-sharing Award

• TITLE OF WORK: JUSOKUN
• Team Name: 100 Percent Practitioner Team

(Screen image of the development of the work (excerpt from the work description material submitted by the team))

• Overview of the work
  • For legal professionals (judicial scriveners, lawyers, government officials, corporate lawyers, etc.), this work provides a high-precision natural-language laws and regulations AI and search explanation.
  • It targets about 500,000 articles in about 9,000 existing Japanese laws and regulations, and instantly identifies relevant articles just by entering the case in natural language.
• Value created for society
  • There is a problem that about 80% of the practical time is spent on the survey because there is no efficient means to extract and process appropriate provisions from the huge amount of laws and regulations information.
  • In addition, with existing services and LLM, text search accuracy is low and hallucination is a problem.
  • With this work, we have moved from "searching" to "being guided." We have created an environment in which practitioners can concentrate on judgment and creation by accurately extracting and presenting optimal primary information across multiple laws and regulations.
• Novelty, etc.
  • High-precision was achieved through multi-stage processing in which the Top20 were extracted through vector search on an article-by-article basis, and the results were re-selected and verified from a practical point of view using "Claude Sonnet 4.5."
  • Implemented laws and regulations that automatically displays relevant provisions by utilizing reference information of function APIs.
• Auditor Comments
  • While it is convenient to be able to obtain necessary information through natural sentence search, it is wonderful that efforts are made to avoid hallucination, which is a problem.
  • When we go beyond laws and regulations and deal with various types of information, it is important to display information in a way that is easy for the receiver to understand.

Laws and regulations Data-Utilization Award

• Title: Restoration Compass
• Team Name: Dango

Development screen image of the work

(Screen image of the development of the work (excerpt from the work description material submitted by the team))

• Overview of the work
  • This is a work that organizes dispersed disaster support systems horizontally for disaster victims and local government employees, and intuitively presents support systems and actions to be taken according to individual situations.
• Value created for society
  • In the event of disasters, support systems are divided into laws and regulations, notification, and operation, and there is a problem that both victims and staff cannot quickly get to the necessary information.
  • This work makes it possible to deliver accurate support information based on the latest laws and regulations to citizens without hesitation or omission.
• Novelty, etc.
  • This work is an innovative work in that it combines structured analysis of clauses based on Japanese laws and regulations standard XML with AI utilization premised on human confirmation, and further optimizes information by game theory.
  • The laws and regulations API and laws and regulations database were used to extract and organize disaster-related laws and regulations and create a guide for citizens.
• Auditor Comments
  • It is easy to use because it has a solid user story and can be used to collect information based on the issues faced by the disaster victims and lead to action.
  • It's a great approach to deterministically extract laws and regulations, which is written in a fairly structured way in natural languages.

Other Works

List of works (PDF/6,116 kb) Please see from .
*Only the work of the team that has permission to post the work outline on the website is posted.

4. Related Information

• "laws and regulations" x "Digital" Hackathon (FY 2025)
• "laws and regulations" x "Digital" Hackathon Held in FY 2024
• Laws and regulations API Hackathon
• Laws and regulations x Digital Workshop
• "laws and regulations" and "Digital" Initiatives (PDF / 10.6 mb)
• "laws and regulations" x "Digital" initiatives to create new legal services and policy-making processes (Digital Agency News)
• Legal affairs Promotion of data utilization in digitalization, laws and regulations, etc.