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. On cost, Aoba-Japan International School has the noticeably lower entry fee — a material difference for budget-conscious families. 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.
More Comparisons
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.
Questions parents ask
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 →