| 1915 |
Founded by Koji Nagai as a personal business as Nagai Shop, a white coat specialty store in Kanda Jimbocho. |
| 1941 |
Abolished individual business and established Tokyo Hygiene White Coat Co., Ltd. with seven other companies in the same industry. |
| 1950 |
Dissolution of Tokyo Hygiene White Coat Co., Ltd. Koji Nagai and Tatsuro Sawato established Nagai Shop Co., Ltd. |
| 1952 |
Renamed to Nagai Clothing Co., Ltd. Introduction of overseas technology related to materials and successive technological innovations. Development of synthetic fibers progressed, ushering in an era of diversification of white coats. |
| 1965 |
Vice President Tatsuro Sawato appointed as President. |
| 1967 |
Fuchu branch opened. |
| 1969 |
Established Nagai White Coat Industry Co., Ltd. in Akita Prefecture to expand the white coat manufacturing division. Tatsuro Sawato appointed as President. Shifted from multi-purpose white coats to manufacturing and sales of medical-use white coats. |
| 1969 |
Established a manufacturing plant in Akita Prefecture in 1969. |
| 1971 |
Developed and sold Japan's first 100% polyester knit white coat. |
| 1973 |
Constructed a product center in Tokyo. Promoted Fuchu store and established Tama Nagai White Coat Limited Company. Set up a production management center in Akita Prefecture. |
| 1974 |
Expanded the route for hospital linen supply business nationwide. |
| 1976 |
Established Hokkaido Nagai Co., Ltd. |
| 1977 |
Built a second product center in Kameido, Tokyo. Partnered with GD Sahl Co., Ltd. in the U.S. and established Japan Surgical Apparel Co., Ltd. in Hiroshima to expand sales of new hospital surgical clothing products. Formed technical alliances with Angelica Corporation in the U.S. and Toray Industries, Inc. Developed and launched white coats for lease using new materials. |
| 1979 |
Changed company name to Nagai Co., Ltd. Established Omagari Factory in Akita Prefecture. Opened Osaka branch. Merged Japan Surgical Co., Ltd. into Nagai Clothing Co., Ltd., forming Hiroshima and Fukuoka branches. |
| 1980 |
Established Takamatsu sales office. Signed licensing agreement with designer Kanji Yamamoto. |
| 1981 |
Set up a white coat distribution center in Akita Prefecture. Built a new Nakasen factory in the same prefecture. |
| 1982 |
Signed a license agreement with designer Sachiko Hanai. |
| 1984 |
Completed the headquarters building in Chiyoda Ward and relocated the Misaki-cho headquarters and Kameido sales office. |
| 1985 |
Established Nagai White Ace in Akita Prefecture. |
| 1987 |
Opened Tohoku branch. Built a new PC center in Akita Prefecture. |
| 1988 |
Spun off Nagai Corporation and established Emit Kosan Corporation, transferring the sales division. Subsequently, both companies changed their names mutually, with Emit Kosan Corporation becoming the group holding company and Nagai Corporation becoming the sales group headquarters. |
| 1989 |
Built Nagai Lumina in Akita Prefecture as a high-grade product manufacturing factory. Started overseas production and pursued international division of labor. |
| 1989 |
Started overseas production in 1989. |
| 1989 |
Started overseas production in 1989, now with production bases in Dalian, China, Indonesia, and Vietnam, offering thousands of items and responding to diverse needs with competitive production activities. |
| 1990 |
Changed the company name to Emit Corporation. Built a health business building in Fukuoka City. |
| 1990 |
Merged Emit Corporation, Nagai Corporation, and Nagai White Coat Industry Corporation for capital restructuring, forming Emit Corporation. Changed the name of Emit Corporation to Nagai Corporation. Established Nagai White Coat Industry Corporation and transferred the production division. |
| 1992 |
Built Nagai Building in Sendai City. Built a cutting center in Akita Prefecture. |
| 1994 |
Changed the company name from Nagai to Nagai Leven Corporation. Built a logistics center in Akita Prefecture. |
| 1995 |
Went public on the over-the-counter market. Started development and sales of second pillar products responding to an aging society. Vice President Ichiro Sawato was appointed president. |
| 1996 |
Signed a license agreement with French designer Courreges. |
| 1997 |
Built Osaka branch building in Osaka City. |
| 1998 |
Opened Taipei branch in Taipei City, Taiwan. |
| 1999 |
Established Nagoya sales office. Signed a license agreement with designer Atsuro Taya. |
| 2000 |
50th anniversary of the company. |
| 2001 |
Listed on the Second Section of the Tokyo Stock Exchange. |
| 2002 |
Entered into a technical partnership regarding surgical textiles with U.S. Standard Textile and Toray Industries. Elevated Nagoya sales office to a branch. |
| 2003 |
Built Nagai Leven West Japan logistics center in Higashihiroshima City. |
| 2004 |
Obtained ISO9001 certification. Listed on the First Section of the Tokyo Stock Exchange. Merged Hokkaido Nagai Corporation and established a branch in Hokkaido. |
| 2005 |
Obtained ISO 14001 certification. Signed licensing agreement with designer Keita Maruyama. |
| 2005 |
Obtained ISO 14001 certification in 2005. |
| 2006 |
Signed brand agreement with designer Minako Yokomori. |
| 2013 |
Relocated Nagoya branch to Higashi-ku, Nagoya City. Signed licensing agreement with Dick Bruna Japan Co., Ltd. |
| 2014 |
Completed new headquarters building in Kanda, Chiyoda Ward. Headquarters relocation. |
| 2015 |
100th anniversary celebration. |
| 2016-09-06 |
Received a commendation from the Minister of Health, Labour and Welfare at MyPlaza in Marunouchi on September 6, 2016. |
| 2017 |
Signed a joint development agreement with Shiseido Co., Ltd. for the "Bright Days" brand. |
| 2018 |
Built a new sewing center in Daisen City, Akita Prefecture. Integrated and operated the Omagari and Nakaisen factories. |
| 2019 |
Elevated Takamatsu sales office to a branch. |
| 2020 |
Delivered 600,000 protective suits for COVID-19 to the Ministry of Health, Labour and Welfare. |
| 2022 |
Transitioned to the Tokyo Stock Exchange Prime Market. |
| 2023 |
Signed licensing agreement with Yagisugimasa Co., Ltd. and Mackintosh Japan Co., Ltd. |
| 2024 |
Renewed Osaka branch showroom. |
