Top 25 Clean Energy Startup Investors in Japan (November 2026)

Portfolio highlights

• Any Style — Any Style develops a messaging app from voice actors that regularly sends messages via subscription. It also engages in the planning and production of audio content and the VTuber production business.
• Green Growth Co. — Green Growth Co. is a startup company engaged in next-generation infrastructure projects centered on renewable energy. The company develops grid-scale battery storage facilities and solar power plants, as well as revitalizes and trades secondary solar assets, thereby creating power sources for both local communities and corporations. It also supports the enhancement of power source value through initiatives such as the digitalization of existing generation facilities, repowering, conversion to the Feed-in Premium scheme, and the co-location of battery storage systems. Furthermore, by aggregating distributed renewable energy resources—via services such as aggregation, Power Purchase Agreements and retail supply—the company implements mechanisms to optimize supply and demand while fostering a circular flow of electricity within local regions. Green Growth also provides hands-on support to companies, assisting them with their Green Transformation initiatives as well as the formulation of power business strategies and the design of operational schemes.
• Typewriter Therapeutics — Typewriter Therapeutics, Inc. develops mRNA-based gene therapies using a gene writing, or gene writing, platform for precise insertion of therapeutic genes into the genome. The company builds on transposon-based technologies originating from research by Professor Emeritus Haruhiko Fujiwara at the University of Tokyo. Its programs focus on all‑RNA,nonviral gene writing systems that repurpose natural genetic elements to address severe genetic disorders with limited treatment options. Typewriter Therapeutics conducts research and development across its U.S. and Japan operations and collaborates with investors and partners to advance genetic medicine candidates toward the clinic.

Portfolio highlights

• Esa — Esa offers plastic waste recycling, and also the development and distribution of plastic products
• ElleThermo — elleThermo aims to implement Semiconductor-Sensitised Thermal Cells (STCs), an energy conversion technology that can generate electricity from unused waste heat above room temperature.
• Advance Composite — Advance Composite is a manufacturing company that develops composite materials and molten metal forging-based products.

Portfolio highlights

• LQUOM — QWAVE offers cryptography communication technology.
• Alxtal — Alxtal is a tech company who optimize the development, design, and manufacturing processes of the manufacturing industry with IT and AI.
• Zerodoor HD — Zerodoor HD specializes in digital transformation in constructing industry.

Portfolio highlights

• Helical Fusion — Helical Fusion is a startup company that aims to commercialize fusion energy using magnetic confinement of high-temperature plasmas. It is a spin-off startup from the National Institute for Fusion Science (NIFS) in Japan that provides a fusion reactor based on the stellarator design, a magnetic confinement approach that enables inherently stable,continuous plasma operation.

Portfolio highlights

• Crosssector — Crosssector provides sensor DX solutions for various kinds of construction and maintenance applications.
• Cosmobloom — Cosmobloom Co. is a manufacturing company that analyses, designs, and develops space solar power generation systems and solar power sails.
• Your Neighboring Company — Kimi no Tonari is a Nagoya-based startup specializing in the development and operation of the AI fortune-telling app "Uracchi"

Portfolio highlights

• Helical Fusion — Helical Fusion is a startup company that aims to commercialize fusion energy using magnetic confinement of high-temperature plasmas. It is a spin-off startup from the National Institute for Fusion Science (NIFS) in Japan that provides a fusion reactor based on the stellarator design, a magnetic confinement approach that enables inherently stable,continuous plasma operation.
• Surv Biopharma — Surv Biopharma develops a drug discovery platform that facilitates research and development of veterinary drugs and pharmaceutical products.
• Cardio Intelligence — Cardio Intelligence develops an AI automated diagnostic system.

Portfolio highlights

• EF Polymer — EF Polymer Private Limited providing 100% Organic and fully Biodegradable Super Absorbent Polymer cum Fertilizer to reduce Water and Fertilizer requirement for your plant. Let's grow organically.
• DigitalArchi — Realizing a revolution in architecture.
• Helical Fusion — Helical Fusion is a startup company that aims to commercialize fusion energy using magnetic confinement of high-temperature plasmas. It is a spin-off startup from the National Institute for Fusion Science (NIFS) in Japan that provides a fusion reactor based on the stellarator design, a magnetic confinement approach that enables inherently stable,continuous plasma operation.

Portfolio highlights

• Kollektion — KLKTN is a curated music, manga and art NFT platform connecting creators with fans through special experiences. The platform allows fans to access special edition digital art and behind-the-scenes moments of artists' creative process. In collaboration with top creators and artists and powered by blockchain technology, KLKTN is takingartist-fan engagement and the best of creative experiential culture into the digital world. Artworks are available as a limited supply of authenticated digital products or NFTs, for purchase via credit card, with a fixed cost per item. KLKTN's co-founders are Jeff Miyahara, Chief Creative Officer and a renowned record producer and songwriter who has produced over 260 international artists; Fabiano Soriani, Chief Technology Officer and former lead blockchain engineer for Dapper Labs; and Daisuke Iwase, Chief Executive Officer, Harvard Business School graduate, former World Economic Forum Young Global Leader, and a digital pioneer known for co-founding Lifenet, a disruptive fintech venture, which he took to IPO. Built on the Flow blockchain to achieve affordable and environmentally-sustainable minting, KLKTN leaves more for artists, fans, and the planet.
• Sustech — Sustech is a technology company that develops platforms for decarbonization support and distributed power generation services.
• Ispace Technologies — ispace is a private lunar robotic exploration company that is developing micro-robotic technology to provide a low-cost and frequent transportation service to and on the Moon, conduct lunar surface exploration to map, process and deliver resources to our customers in cislunar space.

Portfolio highlights

• REVORN — REVORN is a fragrance AI and DX research and development company. They develop products such as odor sensors that can respond to odor issues and needs. They provide consultation at a range of levels, from identifying issues to developing solutions.
• Helical Fusion — Helical Fusion is a startup company that aims to commercialize fusion energy using magnetic confinement of high-temperature plasmas. It is a spin-off startup from the National Institute for Fusion Science (NIFS) in Japan that provides a fusion reactor based on the stellarator design, a magnetic confinement approach that enables inherently stable,continuous plasma operation.
• Illumi Medical — Illumi Medical is a manufacturing company that produces medical equipment and devices for the healthcare sector.

Portfolio highlights

• JIZAIE — JIZAIE is an artificial intelligence firm that wants to combine VR, robots, and wearable computing to create solution.
• Helical Fusion — Helical Fusion is a startup company that aims to commercialize fusion energy using magnetic confinement of high-temperature plasmas. It is a spin-off startup from the National Institute for Fusion Science (NIFS) in Japan that provides a fusion reactor based on the stellarator design, a magnetic confinement approach that enables inherently stable,continuous plasma operation.
• Pixie Dust Technologies — Pixie Dust Technologies is a developer of computational technologies, including its ultrasonic phased array system with which one can generate force in mid-air; transport things in mid-air without touching anything; target and deliver different sounds from person to person in a crowd; direct guide-dogs; and even apply this in agricultural farming.

Portfolio highlights

• Helical Fusion — Helical Fusion is a startup company that aims to commercialize fusion energy using magnetic confinement of high-temperature plasmas. It is a spin-off startup from the National Institute for Fusion Science (NIFS) in Japan that provides a fusion reactor based on the stellarator design, a magnetic confinement approach that enables inherently stable,continuous plasma operation.

Portfolio highlights

• ARK — ARK specializes in the research, development, and manufacturing of land-based aquaculture equipment for sustainable fish farming.
• Terra Labo — Terra Labo conducts research and development on long-range unmanned aerial vehicles.
• Helical Fusion — Helical Fusion is a startup company that aims to commercialize fusion energy using magnetic confinement of high-temperature plasmas. It is a spin-off startup from the National Institute for Fusion Science (NIFS) in Japan that provides a fusion reactor based on the stellarator design, a magnetic confinement approach that enables inherently stable,continuous plasma operation.

Portfolio highlights

• ARK — ARK specializes in the research, development, and manufacturing of land-based aquaculture equipment for sustainable fish farming.
• Gaxi — Gaxie is an IT firm that provides a cloud management system and manages scholarship sites for business.
• Factory X — Factory X is an information technology company that helps to increase value manufacturers with the inventory strategy model.

Portfolio highlights

• Craif — Icaria's mission is to create a new society in which people will not lose their lives by using urine tests to provide "early, painless and accurate early diagnosis of cancer."It is known that detecting cancer early increases the survival rate 5 to 10 times and greatly improves the prognosis. However, it is not unusual for manycancers to have no subjective symptoms, and when they become aware they have progressed to a stage where treatment is impossible. The most effective way to detect cancer at an early stage that can be treated is to have regular and high-precision cancer diagnosis, but existing cancer diagnosis is painful and However, many of them are not accurate enough and are not suitable for regular diagnosis and early stage diagnosis.
• Alpaca — Alpaca API allows developers and businesses to build apps, embed investing, and trade algorithms
• Snack Technologies — Snack Technologies specializes in the development and operation of “SnaTech,” an innovative business support application designed for snack bars, helping operators streamline daily management, improve customer engagement, optimize inventory and sales tracking, and enhance overall business efficiency through digital solutions tailored to the foodand hospitality industry.

Portfolio highlights

• ElleThermo — elleThermo aims to implement Semiconductor-Sensitised Thermal Cells (STCs), an energy conversion technology that can generate electricity from unused waste heat above room temperature.
• Starlight Engine — Starlight Engine develops and commercializes fusion energy power plant technologies.
• Neusignal Therapeutics — Neusignal Therapeutics is a medical company that develops therapeutic medicines for dementia and psychiatric illnesses.

Portfolio highlights

• CaTe — CaTe is based in Tokyo. CaTe develops and manufactures a Digital Therapeutic (DTx) for remote cardiac rehabilitation. Their invention allows heart disease patients to safely and successfully complete cardiac rehabilitation utilizing standing exercise in a confined space, such as at home, without the use of ergometers or similar instruments.
• Flyle — Flyle provides a cloud based platform for product management helping customers to improve productivity & creativity in product development.
• Crosssector — Crosssector provides sensor DX solutions for various kinds of construction and maintenance applications.

Portfolio highlights

• THE RICH — THE RICH is a hair care brand that contains silk regenerating and repairing ingredients.
• Helical Fusion — Helical Fusion is a startup company that aims to commercialize fusion energy using magnetic confinement of high-temperature plasmas. It is a spin-off startup from the National Institute for Fusion Science (NIFS) in Japan that provides a fusion reactor based on the stellarator design, a magnetic confinement approach that enables inherently stable,continuous plasma operation.
• One World Technology — One World Technology Co., Ltd. blends traditional Japanese culture with advanced technology to deliver a modern luxury lifestyle. It offers a shared ownership model for global clientele, allowing them to co-own culturally inspired villas featuring Japanese gardens, teahouses, and refined architectural design.

Portfolio highlights

• Josys — Stop letting runaway SaaS costs & unsecured SaaS access ruin your day. Josys is the only SaaS Management Platform that provides true 360-degree control.
• LIFESCAPES — LIFESCAPES is a research and manufacturer of brain-computer interface equipment.
• Deeping Source — Real-time Video Analytics based on Data Anonymization. High-accuracy computer vision for large-scale spaces: hypermarkets, shopping malls, convention centers, hospitals, logistics warehouses, construction sites, etc.

Portfolio highlights

• Akari Hosho — Akari Hosho provides a group of trusted professionals, including lawyers and judicial scriveners. Akari Hosho provides a guarantee service.
• Black Cat Carnival — Tell us about anything development-related. Our founder, who launched Niconico Live, SUGAR and GANMA! from scratch, helps with planning, design, development and operations.
• Carbon CryoCapture — Carbon CryoCapture specializes in the carbon dioxide separation systems aimed at creating economically viable, energy-efficient, and genuinely sustainable CO2 separation and recovery technologies. The company is dedicated to deploying cost-effective, efficient systems for CO2 capture that integrate smoothly with current infrastructures, all whileenhancing energy consumption and production. This enables clients to attain zero emissions throughout the development and application of resources.

Portfolio highlights

• ATOMica — ATOMica is a co-working space and business management company for conference rooms, event venues, circles, and schools. The company uses coworking spaces as HUBs to provide services that maximize individuals' power. It can be used for a variety of purposes, including coworking space, shared office space, meetings, events, and web seminars. Itis also possible to use it only once. They plan and run local communities that bring together a diverse range of people, including students, workers, businesses, universities, and governments.
• Esree Energy — Esree Energy is a creator of thermal-based energy storage systems designed to effectively store and distribute electricity. The business stores excess energy as thermal differentials using compressed carbon dioxide and heat pump concepts.
• Blossom Energy — Developed advanced nuclear reactors that are able to produce clean energy, Blossom Energy manufactures nuclear reactors for the nuclear energy industry. The focus of the company is on providing affordable, stable, and sustainable energy for the world. The company utilizes HTGR, which is a fourth-generation nuclear reactor.

Portfolio highlights

• Quemix — Quemix is an IT company specializing in providing quantum computing solutions including quantum computers, quantum communication, and quantum sensors. Quemix conducts cutting-edge research in quantum mechanics and mathematical information science, as well as materials science and quantum chemistry. Quemix implements cutting-edge research resultsinto society by fusing them with existing IT and simulation technologies, opening up a world that conventional computers have never reached.
• Helical Fusion — Helical Fusion is a startup company that aims to commercialize fusion energy using magnetic confinement of high-temperature plasmas. It is a spin-off startup from the National Institute for Fusion Science (NIFS) in Japan that provides a fusion reactor based on the stellarator design, a magnetic confinement approach that enables inherently stable,continuous plasma operation.

Portfolio highlights

• JaQool, Inc. — JaQool is a company that will leverage social innovation and new technologies to create convenient services that are something to get excited about. Three entrepreneurs from different backgrounds have gathered together to utilise these new technologies and techniques to develop services that can help to make the world a better place.JaQool willinitially work on a mobile translation service for tourists coming to Japan from overseas. The number of tourists from overseas has been increasing rapidly in recent years, but many have encountered difficulties due to being unable to understand Japanese. Removing the language barrier is a pressing challenge that needs to be addressed, particularly in preparation for the Tokyo Olympics that will be held in 2020. JaQool can help contribute towards a solution.
• Kotozna — Kotozna is an IT service company that aims to solve the social problem of "language cave" using cutting-edge technologies such as AI and machine translation. Multilingual translation services such as "Kotozna Chat", which provides messaging with simultaneous translation between different SNS platforms, and "KotoznaCamera", which translates Japanese content such as restaurant menus and displays them by QR code scanning.
• Blossom Energy — Developed advanced nuclear reactors that are able to produce clean energy, Blossom Energy manufactures nuclear reactors for the nuclear energy industry. The focus of the company is on providing affordable, stable, and sustainable energy for the world. The company utilizes HTGR, which is a fourth-generation nuclear reactor.

Portfolio highlights

• Nudge — Provider of financial planning platform designed to create a financial institution with new values and behaviors from scratch. The company's platform has been strengthening its team, developing the first service, and preparing for the necessary financial license acquisition, enabling users to secure their future financially.
• Helical Fusion — Helical Fusion is a startup company that aims to commercialize fusion energy using magnetic confinement of high-temperature plasmas. It is a spin-off startup from the National Institute for Fusion Science (NIFS) in Japan that provides a fusion reactor based on the stellarator design, a magnetic confinement approach that enables inherently stable,continuous plasma operation.
• Game Server Services — GS2 provides a comprehensive backend-as-a-service platform tailored for game developers, offering over 30 modular server functions. Its smart SDKs include data freshness management and local caching, reducing unnecessary API calls and enhancing performance. It enables developers to focus on game logic and user experience with features like no-codeUI components, anti-cheat mechanisms, and scalable infrastructure.

Portfolio highlights

• Caguuu — Caguuu offers high-quality designer furniture at affordable prices, through e-commerce, eliminating middlemen and store operating costs.
• Luxna Biotech — Luxana Biotech is a biotechnology firm dedicated to promoting the practical use of safe and effective nucleic acid therapies. Utilizing nucleic acid chemistry technology, the company strives to provide nucleic acid medicines to patients suffering from diseases that currently lack effective treatments.
• Link Therapeutics — Link Therapeutics specializes in developing therapeutic methods for targeting autoantibodies and identifying pathogenic autoantibodies.

Portfolio highlights

• Anipos — Anipos is an application that allows you to easily claim pet insurance.
• IoTBASE — IoTBASE offers IoT cloud services.
• Blossom Energy — Developed advanced nuclear reactors that are able to produce clean energy, Blossom Energy manufactures nuclear reactors for the nuclear energy industry. The focus of the company is on providing affordable, stable, and sustainable energy for the world. The company utilizes HTGR, which is a fourth-generation nuclear reactor.