| 1931： |  “Jitsuryoku-Zoshin-kai” established at Kashiwagi Yodobashi-cho, Toyotama-gun, Tokyo. Commenced educational services, mainly distance correspondence education. The founder, Yutaka Fujii, was a former English teacher born in 1898 in Shimonoseki City, Yamaguchi Pref. |
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| 1945： | Evacuated from Tokyo to escape the air raids, and settled in Nakaizu-cho, Tagata-gun, Shizuoka Pref. |
| 1952： | Changed company name to “Zoshin-kai”, with the abbreviation “Z-kai”; resumed services. |
| 1979： | Relocated to a newly-constructed headquarters building in Nagaizumi-cho, Sunto-gun, Shizuoka Pref. Introduced computers to begin streamlining and to improve efficiency. |
| 1981： | Started distribution of textbooks at designated bookstores. |
| 1982： | Launched distance correspondence courses for students studying for high school entrance examinations. |
| 1985： | Converted to a joint-stock corporation. Opened a cram school, “Shingaku Z-kai”, in Shibuya-ku, Tokyo. |
| 1986： | Launched model entrance examination service for junior high school students. Opened offices in Tokyo and Osaka. |
| 1991： | Launched preparatory course for the entrance examination to the University of Tokyo. |
| 1992： | Constructed Tokyo Building in Ebisu, Tokyo. Published the first edition of “Sokudoku-Eitango 1, 2” (Vocabulary building). |
| 1994： | Opened Osaka Learning Center to launch preparatory course for the entrance examination to the University of Kyoto. |
| 1995： | Opened Ochanomizu Learning Center to operate preparatory course for the entrance examination of the University of Tokyo. |
| 1999： | Transferred cram school business in the Tokyo metropolitan area to Tokyo Zoshinkai Inc. Published “Oxford Word Power Dictionary”. Launched distance correspondence course for elementary school students. |
| 2000： | Transferred cram school business in the Kansai region to Tokyo Zoshinkai Inc. Transferred publishing business to Z-kai Publishers Inc. |
| 2001： | Constructed Ochanomizu Building in Kanda-Sudacho, Tokyo. |
| 2002： | Published “Word Power Fully Bilingual Dictionary”. Launched Business Development Courses. |
| 2003： | Changed the name of Tokyo Zoshinkai Inc. to Z-kai Taimen Kyoiku Inc. (cram school). |
| 2006： | Merged Zoshinkai Publishers Inc. (distance correspondence education service), “Z-kai Taimen Kyoiku” (cram school business) and Z-kai Publishers Inc., to form Z-kai Inc. |
| 2007： | Launched video streaming courses. Launched Gakken Classrooms / Z-kai Courses. |
| 2008： | Acquired a part of the university entrance examination business of Gakkyusha Co.,Ltd. Entered a business and capital alliance with ICHISHIN CO., LTD. Entered a business and capital alliance with With us Corporation |
| 2009： | Constructed Z-kai Bunkyo-cho Building in Mishima. Entered a business and capital alliance with Eikoh Inc. |
| 2010： | Launched a distance correspondence course for 4/5 year-old preschool students. |
| 2011： | Established Facultas Co.,Ltd. |
| 2012： | Launched “Digital Z”, providing digital educational materials for pre-school and elementary students. |
| 2013： | Established Z-kai CA Inc. |
| Jan. 2015： | Invested in igsZ., Ltd. Established Z-kai Learning Technology Inc. |
| Jun. 2015： | Opened Z-kai Individual Teaching Center in Futakotamagawa. |
| Jul. 2015： | Formed a long-term strategic partnership with Knewton, Inc. to develop adaptive learning products for students. |
| Aug. 2015： | Formed a business alliance with KDDI to provide educational services making use of the advantages of ICT. |
| Sep. 2015： | Formed a business alliance with Edmodo, Inc. to develop and provide SNS and learning platforms for schools. |
| Oct. 2015： | Established Z-kai Educe Inc. |
| Jan. 2016： | Agreed with Peason Japan K.K. to develop and provide a new digital English educational service. |
| Feb. 2016： | Formed a business alliance with RareJob Inc. to sell online English conversation products and to develop English language educational services. |
