Aoba-Japan International School vs K. International School Tokyo
🇯🇵 Tokyo · Side-by-side comparison on verifiable public data.
Neither Aoba-Japan International School nor K. International School Tokyo sits in a market with a public inspectorate, so both are assessed on verifiable accreditation, curriculum authorisation, and published data rather than an official quality rating. Both are day schools with fees in the same market band — see the table below for the figures, and verify against each school's own published fees.
Key Facts
| Aoba-Japan International School | K. International School Tokyo | |
|---|---|---|
| Curriculum | IB | IB / British |
| Ages | 2–18 | 3–18 |
| Languages of instruction | English | English |
| Annual fees | JPY 2,330,500–3,094,500 | JPY 2,850,000–3,020,000 |
| Enrollment | 600 | 660 |
| Boarding | Day only | Day only |
| Accreditations | CIS, NEASC | CIS, Edexcel |
Strengths
- ✓Long operating history (since 1976) and IB World School status since 2015
- ✓Dual external accreditation (CIS + NEASC) plus IB authorization
- ✓Distinctive entrepreneurship/innovation positioning, backed by BBT's business-education parentage
- ✓Strong language-inclusion model: native-English faculty plus integrated Intensive English Preparation through Grade 8
- ✓High diversity (~50 nationalities) while remaining accessible to Japanese-heritage families
- ✓Outstanding, transparently published IB DP results (42.0/45 in 2025; five-year track record above 41)
- ✓Full CIS accreditation on a 5-year evaluation cycle — strong external quality assurance
- ✓Single-campus K1–G12 continuity (ages 3–18) — no transition between schools
- ✓Central, highly accessible Tokyo location (Shirakawa, Koto-ku); new 2024 main building
- ✓Established history (since 1997) with deep IB roots (IB World School since 2002)
Trade-offs
- !'Full IB Continuum' marketing vs. evidence that MYP may be candidate-stage, not authorized — a continuity gap in the middle years
- !Multi-campus, age-split sites (2–6 vs 3–15 vs 15–18) can mean transitions between physical campuses
- !No published verified IB average — only a reported range (27–40); cohort-level outcomes not transparently public
- !Heavily Japanese-connected student body (~65% with at least one Japanese parent) may dilute the international-immersion some expat families expect
- !Accreditation/authorization detail relies partly on a Wikipedia article with maintenance flags
- !No EAL/language support for Grade 8 and above — students needing English help are explicitly not accepted
- !The IB continuum is incomplete in practice: MYP is no longer offered, and middle years run on Edexcel iLowerSecondary/IGCSE
- !High fees (~¥2.85M–3.02M annual tuition plus ¥700K capital and other one-time fees)
- !Third-party review sentiment is weak (small, unverified sample)
- !Enrollment/nationality figures differ between official site (~700/50+) and aggregators (660/45)
Best Fit For
- • Families (esp. Japan-resident or mixed-heritage) wanting an English-medium IB pathway with strong EAL onboarding
- • Students drawn to entrepreneurship, innovation and project/STEAM-oriented learning
- • Families needing a 2-to-18 single-provider pathway in northwest/central Tokyo
- • Families seeking a top-tier, results-driven IB Diploma outcome
- • Children entering in the early years (K1–early primary) who can grow up in the system
- • English-fluent international and bilingual families based in central/east Tokyo
University Placement
School-reported · not independently verified
School-reported, unverified: IB Diploma results cited as a range of 27–40, with 100% of graduates progressing to further education. No published average score or independently verified destination list was found.
School-reported: KIST publishes detailed IB DP results (42.0/45 average, 100% pass rate, 25% scoring 45 in 2025). A university-acceptance page exists but specific destination figures were not captured; treat placement claims as school-reported, unverified.
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Frequently Asked Questions
Should I choose Aoba-Japan International School or K. International School Tokyo?
Aoba-Japan International School is best for: Families (esp. Japan-resident or mixed-heritage) wanting an English-medium IB pathway with strong EAL onboarding. K. International School Tokyo is best for: Families seeking a top-tier, results-driven IB Diploma outcome. The right choice depends on target curriculum, budget, and family priorities — the two are not linearly comparable.
How do fees compare between Aoba-Japan International School and K. International School Tokyo?
Aoba-Japan International School: JPY 2,330,500–3,094,500. K. International School Tokyo: JPY 2,850,000–3,020,000. Verify against each school's own published fees; some figures are sourced from third-party aggregators.
What curricula do Aoba-Japan International School and K. International School Tokyo offer?
Aoba-Japan International School: IB. K. International School Tokyo: IB, British.
Do Aoba-Japan International School or K. International School Tokyo offer boarding?
Aoba-Japan International School: day school only. K. International School Tokyo: day school only.
This comparison is BrightKey's independent assessment using verifiable public data only. University-placement figures are school-reported and not independently verified. BrightKey takes no payments from schools. Our method →