The Japanese shipping industry is gearing up for a shift towards cleaner marine fuels, with a particular focus on methanol as a bridging fuel. Methanol is seen as a transitional option until the commercialization of ammonia- and hydrogen-fueled vessels, which are expected to play a significant role in reducing greenhouse gas emissions in the maritime sector. The International Maritime Organization (IMO) has set a target to achieve net zero emissions in international waters by 2050, prompting Japanese firms to invest in methanol-fueled vessels to contribute to this goal. The development of methanol-fueled ships is on the rise, with an increasing number of vessels expected to be commissioned globally in the coming years. Japanese companies are actively involved in methanol projects, investing in e-methanol production projects both within and outside Japan to secure the necessary fuel supply. While methanol can reduce greenhouse gas emissions by 15%, it is primarily viewed as a transitional solution due to its limited emission reduction capabilities. In parallel, Japan is also focusing on promoting the development of cleaner marine fuels such as ammonia and hydrogen. Financial support is being provided to aid in the development of zero-emission ships using these fuels, with the utilization of such vessels expected to materialize around 2030. The Ministry of Land, Infrastructure, Transport and Tourism in Japan is spearheading efforts to support the development of engines, fuel tanks, and other core technologies for zero-emission ships. Overall, while methanol serves as a vital bridging fuel in the transition towards cleaner marine fuels, Japan's long-term goal is to introduce much cleaner options like ammonia and hydrogen to achieve net-zero emissions in the maritime sector.