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Founded: May 2, 1975 (Showa 50)
Founded
Established World Publishing Co., Ltd., a company dedicated to publishing educational materials.
Established: July 14, 1978 (Showa 53)
Established
Changed its name to National Education Research Institute Co., Ltd.
Absorbed World Minner Co., Ltd. and changed its name to Zenkken Headquarters Co., Ltd.
Started an IT business by opening the Internet-integrated learning academy Seisai Academy (now Z NET SCHOOL).
Launched e-marketing business (established media business).
Divested the language business and established Zenken Career Center Co., Ltd.
Renamed Zenken Career Center Co., Ltd. to Language Co., Ltd.
Language Co., Ltd. launched the English conversation Skype lesson 'Linguage Speak'.
Language Co., Ltd. opened the first Linguage English conversation school classroom at Shinjuku West Exit.
'Zenken Plaza II' was completed and the real estate business was started.
Acquired Sai Seed Co., Ltd., a company focused on paid job placement.
Absorbed Language Co., Ltd.
Sai Seed Co., Ltd. started an AI business.
Opened Language Japanese School.
Established the Diversity Division as an overseas IT talent business.
Established ZENKEN INDIA LLP in Bangalore, India.
Moved headquarters to 6-6 Nishishinjuku, Shinjuku-ku, Tokyo.
Shares listed on the Tokyo Stock Exchange Mothers
Transferred the English conversation school business
Established Zenk Ken Care Co., Ltd., a company aimed at operating flagship facilities utilizing overseas nursing care personnel
Commenced overseas nursing care personnel business
Transferred Sai Seed Co., Ltd.
Renamed to Zenken Co., Ltd.
Moved headquarters to 1 Azabudai, Minato-ku, Tokyo
Zenken Inc. was featured in Weekly Real Estate Management with an article about the business matching agreement with Rison Comprehensive Research Institute. Details can be confirmed on the official website.
An article has been published on Coki regarding the business matching contract signed with the Risona Research Institute. Please see the article for details.
An article about Zenken Co., Ltd.'s overseas nursing care workforce business was published in the ASEAN Economic Communication. The article details can be viewed at a link that requires membership registration.
Zenken Corporation and NSDC International Limited visited the Chief Minister of Manipur on October 23, 2026. Five Japanese nursing care companies accompanied the visit, exchanging views on reception systems and human resource development. Zenken operates a business introducing skilled nursing care workers from Northeast India to Japan, and this visit aimed to strengthen cooperation with the state government and enhance the selection and training system.
Zenken Co., Ltd. had an article about its business matching agreement with Risona Comprehensive Research Institute reposted on Yahoo! News. The article reports on the contract details related to overseas talent recruitment and other business. Please see the link for details.
On November 1, 2026, Zenken entered into a business matching agreement with the Resona Research Institute to collaborate on overseas talent introduction services. Through the institute, four Resona Group companies will introduce enterprises seeking to utilize overseas talent to Zenken, which will leverage its overseas talent introduction and training expertise to help companies address labor shortages. The partnership includes the introduction of Indian engineering talent and support for development labs.
An article was published in Jiji Tsushin about the business matching agreement signed with Resona Comprehensive Research Institute.
An article about the business matching agreement between Zenken Inc. and Tisano Comprehensive Research Institute was published on VOIX biz.
It is announced that an article about Zenken Co., Ltd. has been published on THE GOLD ONLINE.
An article about Zenken Co., Ltd.'s web marketing business was published on Traders Web. Details are provided at the linked page.