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.

Hayashizaki Wataru

Principal

Tetsu Nakajima

General Partner

Past deals in Wearables

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.

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.

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.

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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