Japanese demand for methanol as an alternative marine fuel is on the rise, with expectations of increased usage as a transition fuel before the commercial launch of ammonia- and hydrogen-fueled vessels to reduce greenhouse gas emissions in the global maritime sector. The International Maritime Organization has committed to achieving net zero emissions in international waters by 2050, prompting the launch of methanol-powered vessels globally. Japanese firms are heavily involved in methanol projects, investing in e-methanol production projects and exploring modifications to existing vessels for renewable fuel use. While methanol can only reduce GHG emissions by 15% compared to traditional bunker fuel, it can significantly lower sulphur oxide and nitrogen oxide emissions. Japan is also focusing on developing ammonia and hydrogen-fueled ships, supported by financial aid and technological advancements. The move towards cleaner marine fuels is crucial to meet the net-zero emission goal in the maritime industry.