Mizuki worked at Sumitomo Mitsui Banking Corporation and SMBC Nikko Securities before joining UntroD Capital Japan, which manages Real Tech Fund, in 2015. Since October 2026, Mizuki has served as Director, Real Tech Fund.

He supports startups with technologies that are indispensable for human space exploration such as ispace (lunar lander), QPS Laboratories (small radar satellite), Arkedge Space (nano-satellite and probe), BEAM Technologies (space semiconductors), JAOPS (spacecraft operation systems), WOTA (autonomous water recycling unit), IntegriCulture (cultivated meat), and Emulsion Flow Technologies (rare metal recycling technology).

In 2019, along with JAXA and SIGMAXYZ and more than 30 other companies and research institutions, he established the Space Food X program that aims to solve issues revolving food on space and here on Earth. In 2020 he founded SPACE FOODSPHERE and is now the representative director. He is also in charge of research and development for the strategic project led by the Cabinet Office under the Stardust Program; “Development of an Advanced Resource Recycling Food Supply System to Support Long-Term Stay on the Moon and other bodies”.

He has a Masters in Bioinformatics from Keio University.