This report provides a comprehensive overview of Japan's investment initiatives in the hydrogen and ammonia sectors, both domestically and internationally. With a vision to become a "hydrogen society" and combat carbon emissions, Japan aims to significantly boost its annual hydrogen supply to 12 million tonnes by 2040, necessitating an investment of 15 trillion yen ($107 billion) over the next 15 years. The report highlights the key international projects pursued by Japanese companies, focusing on hydrogen supply chains in Australia and the United Kingdom. Additionally, it discusses domestic projects, emphasizing the rising interest in green hydrogen initiatives to decarbonize industry clusters within Japan.