| February 2005 | General Manager of Chemical Plant Department at Kawasaki Heavy Industries, Ltd. He left the company after serving as the director of the project development department and the secretary general of the Urban Environment and Energy Association (formerly the District Air Conditioning Association). |
| March 2005 | E. I. Engineering Co., Ltd. establishment |
| April 2008 | Energy simulation software Enepro21 Lite released |
| September 2008 | Energy simulation software Enepro21 Regular released |
| May 2010 | Released Etomas21, a software that complies with the revised Energy Conservation Law. |
| August 2010 | Enepro21 simulation software patent granted |
| November 2012 | Enepro21 Multi1 released |
| March 2013 | Enepro21 US patent granted |
| April 2014 | Enepro21 ver3 released Supports solar power generation and solar heat utilization |
| August 2016 | Power / heat load prediction system EPS21 released |
| September 2016 | Enepro21 Ver.4 released |
| April 2017 | EPS21 heat load prediction system patent granted |
| December 2017 | Launch of Enepro21 Expert, an optimal driving support system |
| December 2020 | Enepro21 Expert Optimal driving support system patent granted |
| December 2020 | Enepro21 Ver.5 released (Japanese / English switching) |
