| Year | History |
|---|---|
| 1988.3.5 | Kokusai Gakuin Upper Secondary Vocational School was opened. |
| H3.3.5 (1991) | The first graduation ceremony was celebrated. |
| H5.9.28 (1993) | Kokusai Gakuin 30th Anniversary Ceremony was celebrated. |
| H10.4.1 (1998) | Kokusai Gakuin High School was opened. Full-time and Integrated Course; Capacity 216 students Makoto Ono, The President of Kokusai Gakuin Educational Foundation, assumed the office of the first principal. |
| H10.4.11 (1998) | Makoto Ono, The President of Kokusai Gakuin Educational Foundation, declared the opening and the first entrance ceremony was celebrated. |
| H11. 4.1 (1999) | Vice Principal Hiroyuki Ono assumed the office of the second Principal. |
| H13.3.17 (2001) | The first graduation ceremony was celebrated. |
| H14.4.1 (2002) | Correspondence Course was opened. |
| H15.10.29 (2003) | Kokusai Gakuin 40th Anniversary Ceremony was cerebrated. |
| H17.3.28 (2005) | Graduation Research was admitted as one of the Promoting Educationla Reform Model Projects by the Ministry of Education,Culture,Sports,Science & Technology |
| H17.10.14 (2005) | Sister schools affiliation with Archbishop Carney Regional Secondary School in British Columbia, Canada. |
| H18.12.1 (2006) | Overseas Study was admitted as one of the Promoting Educationla Reform Model Projects by the Ministry of Education,Culture,Sports,Science & Technology |
| H19.11.8 (2007) | Makoto Ono, The President of Kokusai Gakuin Educational Foundation, was awarded ‘Order of the Rising Sun’. |
| H20.10.15 (2008) | ‘Language Training Course’ was admitted as one of the Promoting Educationla Reform Model Projects by the Ministry of Education,Culture,Sports,Science & Technology |
| H20.12.10 (2008) | Kokusai Gakuin 45th Anniversary Ceremony was celebrated. |
| H22.7.9 (2010) | Kokusai Gakuin High School was admitted as a first high school member of UNESCO Associated Schools Project Network in Saitama Prefecture. |
| H25.4.1 (2013) | Kokusai Gakuin Junior High School was opened. |