The school was established in April 2010 in the city of Hachioji by Yoshinori Kato.

The following year, the campus moved to Sunagawa, and added the 2nd and 3rd grades to the school's elementary division.

In 2014, all the elementary school students moved to Hachioji campus.

Then 2015, all Tokyo West International School students moved to the new Hachioji main campus.

[citation needed] The school's facilities currently include 12 classrooms, a library, a science room, a music room, an outdoor swimming pool, an artificial turf field, an tent gym as well as a small netted rooftop.