Contact us

KIST will be closed for the summer vacation from Saturday, June 29 through Sunday, July 28, 2024. We will be unable to respond to any inquiries received during this period until we re-open on Monday, July 29. We apologize for any inconvenience this may cause.

Please use any of the methods listed below to contact KIST. To contact our separate preschool facility, K. International Preschool (KIPS), click here.


Please use our inquiry form.


All general inquiries about the school should be sent to this address only. Notifications of student absence, late arrival or early departure should also be sent to this address.

If you are a KIST parent/guardian and wish to contact individual teachers or staff, click here to view our Faculty Directory (log in required).


From inside Japan

03-3642-9993 (English)

03-3642-9992 (Japanese)

From outside Japan

+81-3-3642-9993 (English)

+81-3-3642-9992 (Japanese)


From inside Japan


From outside Japan


Postal address

1-5-15 Shirakawa, Koto-ku, Tokyo, Japan 135-0021

Click here to view details of our location.

Office hours

General inquiries: 8:00 a.m. to 6:00 p.m. (Monday to Friday)

Admissions inquiries: 8:00 a.m. to 5:00 p.m. (Monday to Friday)

KIST is closed on weekends and some national holidays. We also close at various other times during the school year. Please check our school calendar for more details.