15th Rock

Founded in Tokyo, Japan in 2019, 15th Rock is a venture capital firm focusing on investments that enhance human capabilities and improve quality of life. They concentrate on seed and pre-IPO rounds across sectors such as robotics, electronics, AR/VR, biotechnology, and IT.

Tetsu Nakajima

General Partner

Hayashizaki Wataru

Principal

21 past transactions

Siiibo

Venture Round in 2025
Siiibo is a developer of an information platform designed to facilitate the issuance and purchase of private bonds for both private investors and companies. The platform aims to create a free, transparent, and equitable direct finance environment. It offers advisory services to companies, assisting them in diversifying their funding through small private placement bonds. Additionally, Siiibo helps build relationships between companies and investors, enabling private investors to gain familiarity with the corporate bond issuance process. Through its innovative approach, Siiibo seeks to streamline access to private bond markets and enhance investment opportunities.

JIZAIE

Series A in 2025
JIZAIE is an artificial intelligence company focused on enabling safe, remote work for essential and blue-collar operations. The company develops a platform that integrates virtual reality, robotics, and wearable computing to provide real-time remote control and monitoring capabilities. Its solution supports heavy equipment operation, remote supervision of traffic guidance sites, and line operations at food manufacturing facilities, allowing work to be controlled from distant or harsh environments to reduce on-site accidents. By combining immersive interfaces with remote sensing and control, JIZAIE aims to improve productivity and safety in industries where direct presence is hazardous, delivering tools that help manage complex tasks and keep workers out of dangerous conditions.

Cellid

Venture Round in 2025
Cellid is a developer of hardware and software products focused on augmented reality technology. The company specializes in display modules, particularly waveguides, and spatial recognition engines designed for AR glasses. Its offerings include a range of products such as micro projectors, model builders, and position finders. These innovations enable users to interact with and recognize data related to human movement and environmental context, enhancing the overall augmented reality experience. Cellid aims to advance the capabilities of AR technology through its proprietary optical simulation and spatial recognition technologies.

Nobi

Series B in 2025
Nobi is a smart lamp that ensures help can be provided in a flash in the event of a fall. It recognizes a fall, and it will notify a family member, contacts, or a specialized emergency call center. The lamp will then connect to that person to reassure them that help is on the way. If necessary, it can even unlock the smart lock on the front door.

Pacific Meta

Series A in 2025
Pacific Meta is a tech startup developing a web3 platform to advise businesses on blockchain technology implementation. It specializes in product localization for the Japanese market and community management services, assisting businesses in social media promotion and collaborations with crypto influencers.

Proton Intelligence

Seed Round in 2024
Proton Intelligence develops a wearable device that monitors potassium levels in real-time via interstitial fluid, closely correlated to blood. This enables clinicians and patients to manage medications and diets effectively for improved heart and kidney care, particularly targeting hyperkalemia in chronic kidney disease patients with co-morbidities.

EneCoat

Series C in 2024
EneCoat Technologies, established in 2018 and headquartered in Kyoto, Japan, specializes in the manufacturing and sale of perovskite solar cells and associated materials. The company focuses on developing and commercializing thin-film solar cell technologies, aiming to generate power even in low-light conditions. EneCoat's mission is to protect the environment and efficiently harness natural energy sources, enabling businesses to conveniently produce energy from solar cells.

Yamap

Series D in 2024
Yamap is a technology company focused on developing web and application solutions for mountain climbing and outdoor activities. Its signature platform leverages global positioning system signals from satellites to enable users to track each other's locations, even beyond mobile phone service coverage areas.

Ripcord

Venture Round in 2024
Ripcord is a robotic digitization company that develops platforms and software to convert physical documents into digital, searchable data and streamlined workflows. Its Canopy solution uses artificial intelligence and machine learning to capture, enrich, and organize content, enabling enterprises to simplify processes and improve accuracy. The company combines sensors, automation, and vision-guided robots to create a digital twin of information, perform document scanning and recognition, and accelerate data capture, organization, and retrieval. This supports faster, higher-quality processing and moves organizations toward paperless document management and more efficient operations. Headquartered in Los Angeles, Ripcord was founded in 2014.

JIZAIE

Series A in 2024
JIZAIE is an artificial intelligence company focused on enabling safe, remote work for essential and blue-collar operations. The company develops a platform that integrates virtual reality, robotics, and wearable computing to provide real-time remote control and monitoring capabilities. Its solution supports heavy equipment operation, remote supervision of traffic guidance sites, and line operations at food manufacturing facilities, allowing work to be controlled from distant or harsh environments to reduce on-site accidents. By combining immersive interfaces with remote sensing and control, JIZAIE aims to improve productivity and safety in industries where direct presence is hazardous, delivering tools that help manage complex tasks and keep workers out of dangerous conditions.

Onera Health

Series C in 2024
Onera Health, Inc. specializes in sleep diagnostic solutions and services aimed at identifying sleep disorders such as insomnia, sleep apnea, and narcolepsy. Founded in 2017 and headquartered in Palo Alto, California, with a research and development office in Eindhoven, the Netherlands, the company utilizes advanced sleep diagnostic patch systems that collect and analyze sleep data. These innovative solutions are designed to enhance patient care by providing comprehensive sleep test data to healthcare professionals across various settings, thereby improving the management of sleep-related ailments and potentially benefiting other medical fields through remote monitoring of chronic conditions. Onera Health's mission is to improve the health and quality of life for individuals struggling with sleep issues while also contributing to cost reductions in healthcare.

Better Place

Series B in 2023
Better Place is a company focused on creating a supportive environment for individuals working in sectors such as childcare and long-term care. By managing a defined benefit pension system, Better Place aims to enhance the welfare and financial security of those who contribute to societal development. The company's mission emphasizes the importance of kindness and aims to alleviate the financial concerns of employees, allowing them to work in their own way without the burden of monetary worries. Through its initiatives, Better Place seeks to ensure that clients can secure their employees' futures once they retire, thereby fostering a more compassionate and sustainable community.

Paradromics

Series A in 2023
Paradromics, Inc. is a company focused on developing advanced brain-machine interfaces aimed at transmitting data between the brain and external devices. Founded in 2015 and based in Austin, Texas, Paradromics manufactures implantable systems that facilitate neural data decoding, converting intricate neural recordings into data streams suitable for various neural prostheses. The company's technology is designed to enhance data transmission rates, providing high-volume, bidirectional data streaming capabilities. This innovation aims to assist individuals with neurodegenerative diseases and other neurological conditions by compensating for the loss of biological connectivity. In addition to its core products, Paradromics also develops applications to support its technology solutions.

Petokoto

Series A in 2021
Petokoto is a pet wellness company that develops and sells fresh pet food, operates pet media, and provides a comprehensive pet information platform and services. The platform combines expertise from internal and external contributors to create a trusted information source on nutrition, health, and care. It also offers a safe matching service to connect prospective adopters with dogs and cats and provides pet-related services and information about dog cafés and inns, aiming to reduce abandonment and help owners maximize their pets’ happiness.

Bisu

Seed Round in 2021
Bisu is a health technology company that offers a home health lab designed to enhance personal well-being through urine and saliva tests. Its devices monitor various health metrics, including dietary health, fat metabolism, and hydration levels, providing users with daily feedback on electrolytes, hydration, pH, ketones, and uric acid via a mobile application. This functionality enables individuals to track burned body fat, maintain metabolic health, achieve optimal ketosis, and improve physical endurance. Bisu has received recognition for its innovation, having been awarded by prestigious organizations such as Johnson & Johnson Innovation and MedTech Innovator, and it gained further acclaim at CES 2020 with the IHS Markit Innovation Award.

Onera Health

Series B in 2021
Onera Health, Inc. specializes in sleep diagnostic solutions and services aimed at identifying sleep disorders such as insomnia, sleep apnea, and narcolepsy. Founded in 2017 and headquartered in Palo Alto, California, with a research and development office in Eindhoven, the Netherlands, the company utilizes advanced sleep diagnostic patch systems that collect and analyze sleep data. These innovative solutions are designed to enhance patient care by providing comprehensive sleep test data to healthcare professionals across various settings, thereby improving the management of sleep-related ailments and potentially benefiting other medical fields through remote monitoring of chronic conditions. Onera Health's mission is to improve the health and quality of life for individuals struggling with sleep issues while also contributing to cost reductions in healthcare.

TENT Japan

Venture Round in 2021
TENT Japan operates an online platform that specializes in the rental of outdoor equipment and camping tents. The company focuses on providing a comprehensive product management and distribution system, alongside a rental-only inventory management tool that employs Radio-Frequency Identification (RFID) technology. This innovative approach aims to reduce the barriers to purchasing outdoor gear, promote sustainable consumption, and help minimize waste of goods and resources. Through its services, TENT Japan seeks to facilitate outdoor experiences while encouraging environmentally responsible practices.

Additive Manufacturing Technologies

Series A in 2021
AMT specializes in automated post-production technology for additive manufacturing. Its platform, PostPro, enhances cost efficiency, quality, safety, and throughput in the production of 3D printed parts.

Longan Vision

Seed Round in 2020
Longan Vision, established in 2018 and headquartered in Hamilton, Canada, specializes in developing advanced goggles for firefighters. Their signature product, the Fusion Vision System, is a helmet-mounted augmented reality device that overlays thermal information onto the user's field of view, enabling firefighters to navigate low-visibility environments more efficiently and safely. This hands-free system aids in quick and accurate decision-making, helping first responders to locate victims and fire sources more effectively.

Sun Asterisk

Venture Round in 2020
Sun Asterisk is a digital creative studio focused on promoting industrial digitalization. The company offers services that support startups through various methodologies including design thinking, lean startup principles, and agile development. Additionally, Sun Asterisk provides recruiting services to help businesses find the talent they need.

Gojo & Company

Series C in 2019
Founded in 2014, Gojo & Company is a Tokyo-based holding company that enables financial inclusion for underserved communities worldwide. It invests in and partners with microfinance institutions across Southeast Asia, South Asia, Central Asia, the Caucasus, and Africa, aiming to provide access to financial services regardless of one's background.
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