The Japanese shipping industry is gearing up for a transition to methanol as a marine fuel in the coming years, anticipating an increase in methanol-fueled vessels post-2027. The move towards methanol is primarily aimed at curbing greenhouse gas emissions in the global maritime sector. The International Maritime Organization (IMO) has set a target to achieve net zero emissions in international waters by 2050, spurring the adoption of cleaner fuels. Japanese firms are actively involved in advancing e-methanol production projects to secure the necessary fuel supply. Additionally, companies are retrofitting existing vessels to enable the use of renewable fuels like biofuels, e-methane, and e-methanol. While methanol offers a reduction of up to 15% in greenhouse gas emissions compared to traditional bunker fuel, its role is viewed as a bridging fuel until ammonia and hydrogen-fueled vessels become more prevalent. Japan is channeling efforts and financial support towards the development of ammonia and hydrogen-fueled ships, with plans to realize the utilization of clean vessels around 2030. The Japanese government and state-owned institutions are providing substantial funding for the development of core technologies for zero-emission ships, emphasizing hydrogen and ammonia alongside LNG and e-methane. Despite the potential of methanol as a transitional solution, Japan is resolute in promoting cleaner marine fuels to meet the net-zero emissions goal by 2050. The country's commitment to advancing ammonia and hydrogen as primary marine fuels reflects a positive sentiment towards sustainable shipping practices and environmental responsibility.