February 27th, 2026; Tokyo, Japan: MPower Partners Fund II (“MPower”), a Japan-based global venture capital fund, has invested in MiRESSO Co., Ltd. (hereinafter “MiRESSO”), an Aomori-based Beryllium innovator leveraging proprietary low-temperature refining to accelerate global nuclear fusion.

While global warming intensifies, global demand for electricity is projected to rise exponentially, driven by the expansion of data centers and semiconductor manufacturing facilities essential for AI development. Against this backdrop, fusion energy is increasingly viewed as the ultimate energy source to achieve carbon neutrality by 2050.

The operation of fusion power plants requires beryllium (Be) as a neutron multiplier. However, beryllium is currently cost-prohibitive and global production capacity is significantly underdeveloped, posing a major bottleneck in the widespread advancement of fusion energy. MiRESSO has addressed this challenge by developing a proprietary technology to refine beryllium using a low-cost, energy-efficient process.

MiRESSO is a QST-certified (National Institutes for Quantum Science and Technology) startup, spinning out technology developed by Dr. Masaru Nakamichi of the same organization. Traditional methods for dissolving beryllium ore require extreme conditions, typically around 2,000°C under high pressure. In contrast, MiRESSO’s innovative low-temperature refining technology - which combines proprietary chemical treatments with microwave heating - enables dissolution at just 300°C under atmospheric pressure.

Founder and CEO Dr. Masaru Nakamichi, a graduate of Kinki University’s Department of Nuclear Engineering, previously specialized in fusion blanket engineering and irradiation  technology at the Japan Atomic Energy Agency (JAEA). He later served as the Group Leader for the Breeding Functional Materials Development Group at QST. Leveraging nearly 30 years of research expertise, he founded MiRESSO in Misawa City, Aomori Prefecture, in 2023 to develop fast for a stable, global supply of beryllium.

MPower is proud to announce our investment in MiRESSO, whose low-temperature refining technology and accelerated manufacturing roadmap. In October 2024, MiRESSO signed a comprehensive business partnership agreement with Pacific Metals Co., Ltd. and commenced the development of its pilot production facility, or "BETA" (“Beryllium Testing plant in Aomori”). We will work closely to provide comprehensive support for MiRESSO’s growth, ranging from ESG initiatives (such as enhancing factory safety and corporate governance) to execution of global expansion.

About MiRESSO Co., Ltd.

• CEO: Masaru Nakamichi

• Established: May 2023 

• Location: Misawa City, Aomori Prefecture, Japan

• URL: https://miresso.co.jp/en/

About MPower Partners

MPower Partners is a Japan-based venture capital fund with a mission to empower visionary gamechangers and unlock transformative growth. With our diverse investment team and deep global networks, we identify and support high-potential ventures both in Japan and internationally. We go beyond capital investments by helping drive true and sustainable growth among our portfolio startups via our proprietary ESG framework. On a broader level, as bridge-builders and ecosystem shapers, we hope to leave the Japanese venture capital ecosystem better than we found it, one with more diversity and scale.

Fund website: https://www.mpower-partners.com

For inquiries, please contact: info@mpower-partners.com

This press release has been prepared for the purpose of providing information to qualified institutional investors and potential portfolio companies of the Fund, and is not a disclosure document pursuant to the Financial Instruments and Exchange Act, and does not constitute a solicitation or recommendation to purchase the Fund.