[1] It is sponsored by Keio University,[2] making it an overseas branch of a Japanese private school, or a Shiritsu zaigai kyōiku shisetsu (私立在外教育施設).

[6] Before Keio Academy opened, many children of Japanese nationals on work assignments in the United States returned to Japan to get a high school education.

It had 420 students that year, making it one of the largest Japanese curriculum schools located in the United States.

In 1994 Yasumitsui Nihei, the principal, stated that of the 115 recent graduates, many began attending Keio University while only four went to American colleges.

That year Nihei stated that children resident in Japan may attend Japanese school campuses affiliated with Keio University.