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Chiyoda International School Tokyo (CHIST) — This School Has Closed

Tokyo, Japan

Opened in 2018 as a component co-located with Musashino University Affiliated Chiyoda High School — but multiple industry media outlets report it closed in 2021-22.

Researched by William Prep from published sources. Not yet verified by the school. — Last reviewed by William Prep: 2026-09-24

The legacy William Prep directory listed Chiyoda International School Tokyo (CHIST) as active, with roughly 200 students and IB PYP/MYP/DP status. This research found the opposite: multiple industry media outlets (including ISTimes) report the elementary/middle-school section closed in summer 2021, and the high-school section in spring 2022.

At a Glance

Current Status	Closed (not independently confirmed)as of: 2026-09-24
Closure Timeline	Elementary/Middle: Summer 2021 / High School: Spring 2022 (not independently confirmed)as of: 2026-09-24
Opened	2018 (Musashino University) (not independently confirmed)as of: 2026-09-24
Legacy Directory Listing	Listed as active (incorrect)as of: 2026-09-24

How This Error Likely Happened

The legacy directory's entry was probably accurate at the time it was written (around the 2018 opening) — the problem is that the school's subsequent closure was never reflected in an update. Even the English Wikipedia page for this school doesn't mention the closure and appears similarly stale. This school is a concrete demonstration that a school's existence isn't a fact you check once and file away — it can change.

William Prep’s Analysis

This is where William Prep's policy of continuous re-verification mattered most. Fee amounts and programme details change over time — but so, evidently, can the single most basic fact of all: whether a school exists at all. Had the legacy data simply been carried forward, a family would have been shown information for a school that no longer exists.

The Co-Located Sister School Is Still Operating

The Article 1 school CHIST was co-located with (formerly Musashino University Affiliated Chiyoda High School, now Chiyoda Junior and Senior High School) has been renamed multiple times but continues to operate. Only CHIST itself closed. A family that had been considering this school under its old name should check the sister school's current profile instead.

University Entrance Eligibility in Japan

School-accreditation route	No not publicly confirmedNot applicable — the school has closed.
Student-qualification route (IB, etc.)	No not publicly confirmed

This school has closed. Discussion of eligibility routes no longer applies here.

Admissions

Cycle

該当なし（閉校のため募集していません） (not independently confirmed)

What Japanese Families Should Know

Who Might Find This School a Good Fit

William Prep’s Analysis

Researching this school stands out as one of the most important findings across every batch of this project. Unlike "Makuhari Kokusai Koko," which never existed, this is a case of a school that was real, closed down, and simply never got removed from the record. Few entries make as clear a case that a directory's freshness matters just as much as its accuracy.

Questions to Ask the School

1.What were the exact circumstances and reasons for the closure?
Why this matters: Multiple industry media report the closure timeline, but no information on the reasons was found this session.

Sources & Verification

Search synthesis on Chiyoda International School Tokyo (CHIST) closure — Multiple (incl. ISTimes, globaledu.jp)third-party source · as of: 2026-09-24CHIST — founded/opened by Musashino University in 2018 as a separate, non-Article-1 international-school counterpart co-located with the Article-1 high school, serving Grade 1-10 and reportedly in IB PYP/MYP/DP candidacy — closed: its elementary/middle-school section in summer 2021, and its high-school section in spring 2022, per multiple ISTimes articles that title the school "（閉校）" (closed). The school's current English Wikipedia page does not reflect the closure and appears stale, still describing it as an active IB-candidate school — treated here as outdated rather than authoritative given the more specific and more recent closure reporting. Not independently confirmed against a Musashino University press release directly this session.

Last reviewed by William Prep: 2026-09-24

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