15th Rock

15th Rock, established in 2019 and headquartered in Tokyo, Japan, is a venture capital firm focusing on early-stage investments in human augmentation and consumer services. The company invests in sectors such as robotics, electronics, AR/VR, biotechnology, and IT, with a global investment scope including the United States, Canada, Europe, and Japan. Their investment strategy targets information technology, healthcare, consumer products, business products, and services, aiming to create a better future and enhance quality of life in the era of extended lifespans.

Tetsu Nakajima

Co-Founder, General Partner and Board Member

Hayashizaki Wataru

Principal

Past deals in Wearables

JIZAIE

Series A in 2025
JIZAIE is an artificial intelligence company focused on creating innovative solutions that integrate virtual reality, robotics, and wearable computing. The firm has developed a real-time remote work platform specifically designed for essential and blue-collar workers. This platform serves as a remote control for heavy machinery and facilitates remote monitoring of traffic guidance sites and production line operations in food factories. By enabling businesses to manage work in challenging environments from a distance, JIZAIE aims to enhance operational safety and efficiency, thereby reducing the likelihood of accidents on-site.

Proton Intelligence

Seed Round in 2024
Proton Intelligence, founded in 2020 and headquartered in Vancouver, Canada, specializes in biomarker monitoring to manage chronic diseases and enhance patient outcomes. The company focuses on continuous potassium monitoring, particularly for patients suffering from hyperkalemia associated with chronic kidney disease and other co-morbidities. Proton Intelligence's innovative platform provides accurate and real-time potassium measurements through interstitial fluid analysis, which correlates closely with blood levels. This capability is critical for enabling timely and informed decision-making regarding patient care, allowing clinicians and patients to effectively manage medications, dietary choices, and treatment options. By prioritizing precise monitoring, Proton Intelligence aims to significantly improve the health and lives of individuals affected by hyperkalemia.

JIZAIE

Series A in 2024
JIZAIE is an artificial intelligence company focused on creating innovative solutions that integrate virtual reality, robotics, and wearable computing. The firm has developed a real-time remote work platform specifically designed for essential and blue-collar workers. This platform serves as a remote control for heavy machinery and facilitates remote monitoring of traffic guidance sites and production line operations in food factories. By enabling businesses to manage work in challenging environments from a distance, JIZAIE aims to enhance operational safety and efficiency, thereby reducing the likelihood of accidents on-site.

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.

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.
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