The AI Inc.
Japanese healthcare technology company operating the ON DIARY cloud platform for fitness clubs and health insurance programs.
Last updated September 29, 2026
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Overview
The AI Inc. (株式会社ジ・アイ) is a Japanese healthcare technology company founded in March 2018 by Daisuke Nakajima, who had led the fitness club operator Last Wellness since 2010. The company is part of the Last Wellness group, which operates the fitness club chain "Rare Rare." Drawing on operational know-how from the fitness business and applying technology, The AI Inc. aims to contribute to Japan's healthcare sector, particularly in prevention and pre-symptomatic care. The company's core offering is ON DIARY, a cloud-based operations platform for fitness clubs, 24-hour gyms, and personal training studios. ON DIARY is designed to improve operational efficiency for fitness businesses. Beyond fitness, The AI Inc. has extended the platform to support health insurance associations (kenpo) with specific health guidance services, and to help companies pursuing health management (kenko keiei) support employee health. The AI Inc. has formed partnerships to broaden its health guidance services. In November 2022 it began collaborating with Welcia Pharmacy to offer specific health guidance at drugstores. In March 2023 it started providing health guidance using low-carbohydrate foods from Doctor Riser. In June 2023 it partnered with e-Health Clinic Shinjuku to launch specific health guidance services utilizing online medical consultations. The company also relocated its office in September 2023. Leadership includes CEO Shoji Wakiya, Founder Daisuke Nakajima, and CFO Yusuke Yamada, a certified public accountant and tax accountant. The company is headquartered in Yokohama, Kanagawa Prefecture, and remains privately held.
History
The AI Inc. was established on March 16, 2018, by Daisuke Nakajima. Nakajima had been Representative Director of Last Wellness, a fitness club operating company, since 2010. The new company was positioned as a group healthcare company within the Last Wellness group, which operates the fitness club chain "Rare Rare." Its mission was to contribute to Japanese healthcare, especially in the prevention and pre-symptomatic (mi-byo) domains, by combining healthcare know-how gained from operating fitness clubs with technology. From its founding, the company developed and operated ON DIARY, a cloud-based platform for fitness club operations. The platform targets fitness clubs, 24-hour gyms, and personal training studios, offering solutions to improve operational efficiency. Over time, The AI Inc. expanded the application of ON DIARY beyond fitness into health insurance association (kenpo) programs and corporate health management (kenko keiei). In November 2022, The AI Inc. announced a collaboration with Welcia Pharmacy Co., Ltd. to provide specific health guidance at drugstores. In March 2023, it began offering health guidance services using low-carbohydrate foods from Doctor Riser Co., Ltd. In June 2023, it partnered with e-Health Clinic Shinjuku to launch specific health guidance services utilizing online medical consultations. In September 2023, the company announced an office relocation and a temporary phone service suspension due to line construction. As of the company overview, The AI Inc. is led by Representative Director, President & CEO Shoji Wakiya; Representative Director and Founder Daisuke Nakajima; and CFO Yusuke Yamada, a certified public accountant and tax accountant. Its headquarters is located at Higashi-Totsuka West Building 9F, 90-6 Kawakami-cho, Totsuka-ku, Yokohama, Kanagawa 244-0805. The group company is Last Wellness Inc., which operates fitness clubs.
The AI Inc. was established.
Began collaboration with Welcia Pharmacy to provide specific health guidance at drugstores.
Started providing health guidance services using low-carbohydrate foods from Doctor Riser.
Partnered with e-Health Clinic Shinjuku to launch specific health guidance using online medical care.
Announced temporary phone service suspension due to line construction.
Announced office relocation.
Products and positioning
Healthcare technology provider leveraging fitness club operational know-how to serve prevention and pre-symptomatic care in Japan.
ON DIARY
Cloud-based operations platform for fitness clubs, 24-hour gyms, and personal training studios.
ON DIARY Kenpo Solution
Solution supporting health insurance association programs, centered on specific health guidance.
ON DIARY Health Management Solution
Solution supporting companies in employee health management.
Sources4 sources
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