| April 25, 2003 | OTSL was founded in Chikusa-ku, Nagoya, Aichi, Japan. (Capital: 10,000,000 yen) |
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| February 14, 2007 | Tokyo office was established in Shibuya-ku, Tokyo. |
| December 10, 2007 | Head office moved to Naka-ku, Nagoya, Aichi. |
| July 16, 2008 | Tokyo office moved to Shinjyuku-ku, Tokyo. |
| July 22, 2008 | Okayama office was established in Okayama-shi, Okayama. |
| April 20, 2009 | Miyazaki office was established in Miyazaki-shi, Miyazaki. |
| April 30, 2010 | Okayama office moved to Kita-ku, Okayama-shi, Okayama. |
| November 1, 2010 | Head office moved to Higashi-ku, Nagoya, Aichi. |
| January 7, 2011 | Allocation of new stocks to a third party by Toyota Tsusho Electronics Corporation was carried out, thus the capital became 13,450,000 yen. |
| April 1, 2011 | Miyazaki office moved to another floor in the same building. |
| June 20, 2011 | Tokyo office moved to Chuo-ku, Tokyo. |
| October 21, 2011 | Embedded Systems Educational Research Center was established with DSR Corporation, in Voronezh State University. |
| February 4, 2012 | OTSL concluded the business cooperation with DSR in the field of the business of the near field communication and the embedded software for automotive. |
| June 6, 2012 | OTSL made the agency agreement with SYSGO. |
| November 25, 2014 | Related company EUREKA Inc. was established. |
| November 1, 2015 | Osaka office was established in Osaka-shi, Osaka. |
| April 1, 2017 | Yokohama office was established in Yokohama-shi, Kanagawa. |
| July 15, 2019 | Related company OTSL Germany GmbH was established. |
| January 14, 2020 | Tokyo office moved to Minato-ku, Tokyo. |
| March 1, 2021 | Yokohama office was consolidated into Tokyo office. |
| July 1, 2021 | Osaka office was closed. |
| August 1, 2021 | Okayama office was closed. |
| September 1, 2021 | Miyazaki office was closed. |