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Okinawa Christian School International (OCSI) — WASC and ACSI Mean Different Things

Okinawa, Japan

One of the closest international schools to the Okinawa Institute of Science and Technology (OIST) — reportedly the largest in Okinawa by enrolment.

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

OCSI is reportedly Okinawa's largest international school, enrolling roughly 600 students. It holds both WASC accreditation (reportedly since 1981) and ACSI (Association of Christian Schools International) accreditation (reportedly since 1992).

At a Glance

Enrolment	≈600 (reportedly the largest in Okinawa) (not independently confirmed)as of: 2026-09-24
WASC Accreditation	1981 (reported) (not independently confirmed)as of: 2026-09-24
ACSI Accreditation	1992 (reported; not one of the six university-eligibility bodies) (not independently confirmed)as of: 2026-09-24
Est. First-Year Cost (K-G5)	≈¥1.43M2025-26 · as of: 2026-09-24

Don't Conflate WASC and ACSI Accreditation

OCSI reportedly holds both WASC and ACSI accreditation. What's easy to miss: ACSI is actually one of the six bodies MEXT recognises for the school-accreditation route to Japanese university eligibility (alongside WASC, CIS, NEASC, Cognia, COBIS). So for OCSI specifically, both accreditations could independently matter for eligibility — a relatively unusual case.

William Prep’s Analysis

Many write-ups on Christian-affiliated schools frame ACSI accreditation purely as "quality assurance for faith-based education" — but ACSI is, in fact, one of the six MEXT-recognised bodies for the school-accreditation eligibility route. A school like OCSI holding both WASC and ACSI is worth understanding accurately on that point. That said, both accreditation claims here rest on third-party reporting — neither registry was checked directly this session.

Fees: A Real First-Year Total of About ¥1.43M (Elementary)

OCSI's own fee PDF (2025-26) lists three one-time charges: a ¥20,000 application fee, a ¥20,000 interview/testing fee, and a ¥240,000 enrollment fee (first child). On top of that, an annual PTF fee (¥3,000), facility fee (¥100,000), and materials fee (¥50,000) apply alongside grade-banded tuition (¥1,000,000 for Elementary K-G5), for a genuine first-year total of roughly ¥1,433,000. OIST/SOFA-affiliated families get a 50% enrollment-fee discount. Paying 10 months of tuition in a lump sum by August 10 earns a 2% discount.

University Entrance Eligibility in Japan

School-accreditation route	Yes (not independently confirmed)
Student-qualification route (IB, etc.)	No not publicly confirmedWhether OCSI offers the IB or another curriculum that would trigger the individual-credential route was not confirmed this session.

WASC accreditation is based on third-party reporting, not confirmed against the registry directly this session. ACSI accreditation is not among the six MEXT-recognised bodies and carries a different meaning, unrelated to the university-eligibility route.

Fees & Estimated First-Year Cost

academic year: 2025-26

Application Fee	¥20,000
Interview/Testing Fee	¥20,000
Enrollment Fee (first child)	¥240,000
PTF Fee (annual)	¥3,000
Facility Fee (annual)	¥100,000
Materials Fee (annual)	¥50,000
Technology Fee (annual, G4+)	¥20,000
Tuition (Elementary K-G5)K-G5	¥1,000,000
Tuition (Middle School G6-8)G6-G8	¥1,040,000
Tuition (High School G9-12)G9-G12	¥1,080,000
Estimated First-Year Total	¥1,433,000

Includes: application, examination, enrolment, other, facilities, tuition — Excludes: Excludes the technology fee (not applicable below Grade 4), lunch, and ESL fees (¥140,000, only if required). This uses Elementary (K-G5) as the base.

What Makes This School Distinctive

Two accreditations, both potentially relevant to eligibility routes

Holds both WASC (1981) and ACSI (1992) accreditation

ACSI is one of MEXT's six recognised bodies, not just a faith-education quality marker.

Worth understanding accurately for families weighing the school-accreditation eligibility route.

Admissions

Cycle

未確認 not publicly confirmed

What Japanese Families Should Know

Who Might Find This School a Good Fit

Might suit — OIST-affiliated families, or families in Okinawa seeking a Christian educational environment

Might not suit — Families planning around the IB Diploma (an IB offering wasn't confirmed this session)

William Prep’s Analysis

What mattered in researching OCSI was not treating ACSI accreditation as merely "faith-education quality assurance" and stopping there — checking it against MEXT's actual six-body list instead. A surface-level read would have missed the institutional significance entirely.

Questions to Ask the School

1.What is the current status of WASC and ACSI accreditation, and when is the next review?
Why this matters: Not confirmed against either registry directly this session.
2.Does the school offer the IB or another curriculum that triggers the individual-credential route?
Why this matters: Not confirmed this session.

Sources & Verification

SY 25-26 Tuition & Fees — Okinawa Christian School Internationalprimary source · as of: 2026-09-24Fetched and parsed directly (PDF). New-student fees: application ¥20,000, interview/testing ¥20,000, ESL (if required) ¥140,000, enrollment ¥240,000 (first child)/¥120,000 (additional child) — all one-time. Annual: tuition by division (Elementary ¥1,000,000, Middle ¥1,040,000, High ¥1,080,000), facility fee ¥100,000, materials fee ¥50,000, technology fee ¥20,000 (G4-5 and up), PTF fee ¥3,000. 2% discount for full 10-month tuition paid by Aug 10. OIST/SOFA families get a 50% enrollment-fee discount.
Search synthesis on OCSI history and accreditation — Multiple (incl. OIST, Wikipedia)third-party source · as of: 2026-09-24The largest international school in Okinawa, ≈600 students, K-12. WASC accredited since 1981; ACSI accredited since 1992. Not independently confirmed against ocsi.org's own accreditation page directly this session.

Last reviewed by William Prep: 2026-09-24

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