Gyosei International School was founded in 1979 as a branch of the well-known Gyosei Gakuen in Tokyo for the purpose of providing education for returnees. The high school division was created in 1981. In 1984 Gyosei International School became an independent entity from the Tokyo Gyosei Gakuen. In 1996 a co-educational elementary school was established and the junior and senior high school divisions became co-educational.