Seisen International SchoolTuition, Admissions & Curriculum
William Michihiko Akiyama
William Prep
Tokyo, Japan
A Catholic girls' school with a coeducational Montessori kindergarten, running the full IB continuum (PYP/MYP/DP) from Grade 1 onward.
Last reviewed by William Prep: 2026-09-24
Seisen was founded in 1962 by the Handmaids of the Sacred Heart of Jesus. Its Montessori kindergarten is coeducational; from Grade 1 onward it is reportedly a girls-only school running the full IB continuum (PYP/MYP/DP).
At a Glance
| Coeducation | Coed kindergarten only; girls-only Grade 1–12 (not independently confirmed)as of: 2026-09-24 |
| Curriculum | Full IB continuum (PYP/MYP/DP) (not independently confirmed)as of: 2026-09-24 |
| Enrolment | ≈700 (40+ countries) (not independently confirmed)as of: 2026-09-24 |
| Est. First-Year Cost (G1–5) | ≈¥3. 83M2026-27 · as of: 2026-09-24 |
01Tuition & Fees
Fees: A Real First-Year Total of About ¥3. 83M (Grade 1–5)
Seisen's own 2026-27 fee schedule lists three non-refundable one-time charges: a ¥30,000 application fee, a ¥300,000 registration fee, and a ¥700,000 land and building development fee. On top of that, an annual ¥150,000 building maintenance fee applies alongside grade-banded tuition (¥2,650,000 for Grade 1–5). Added together, a genuine first-year total comes to roughly ¥3,830,000. IB exam fees (¥20,000/subject) and the school bus (¥310,000 one-way / ¥420,000 round-trip) are separate.
academic year: 2026-27
| Application Fee | ¥30,000 |
| Registration Fee | ¥300,000 |
| Land and Building Development Fee | ¥700,000 |
| Building Maintenance Fee | ¥150,000 |
| Tuition (Grade 1–5)G1-G5 | ¥2,650,000 |
| Tuition (Grade 6–8)G6-G8 | ¥2,700,000 |
| Tuition (Grade 9–12)G9-G12 | ¥2,700,000 |
| Estimated First-Year Total | ¥3,830,000 |
Includes: application, registration, capital, facilities, tuition — Excludes: Excludes school bus, IB exam fees (¥20,000/subject), the Grade 12 graduation fee, and iPad costs. This uses Grade 1–5 tuition as the base.
02Admissions
| Cycle | 未確認（Grade 1–11は英語・算数試験と家族面接あり） (not independently confirmed) |
University Entrance Eligibility in Japan
| School-accreditation route | Yes (not independently confirmed) |
| Student-qualification route (IB, etc.) | Yes |
The CIS/NEASC accreditation is based on third-party reporting, not confirmed against either registry directly in currently available public information. Independent of that, a student completing the full IB Diploma qualifies via the individual-credential route regardless.
What Japanese Families Should Know
Questions to Ask the School
1.What is the current status of the CIS and NEASC accreditations, and when is the next review?
Why this matters: Public information does not establish this clearly; confirm it directly with the school.
2.What is the IB DP average score, and where do graduates matriculate?
Why this matters: Public information does not establish this clearly; confirm it directly with the school.
03Curriculum
04School Features
Coeducational Only at Kindergarten — a Real Constraint for Families With Sons
Seisen's Montessori kindergarten is coeducational, but Grade 1 onward is girls-only. That means a family with a son enrolled at the Seisen kindergarten needs to plan a transfer before Grade 1 — a structural fact that directly shapes school choice, not something a generic "international school" label would tell you.
Key Point
For families hoping to keep one child at one school from kindergarten through graduation, this is the first thing to check before applying — not something to discover after enrolling. For families actively seeking a girls-only environment from Grade 1 onward, the same structure is a point in the school's favor rather than a caveat.
What Makes This School Distinctive
A coeducational Montessori kindergarten inside a girls' school
Boys and girls both attend kindergarten; only girls continue into Grade 1
Reported as, since July 2020, the first all-girls IB continuum school in Japan.
Families with sons need to plan for a post-kindergarten transfer from the moment they enroll, not discover it later.
Who Might Find This School a Good Fit
Might suit — Families wanting a girls-only environment continuously from Grade 1 through graduation
Might not suit — Families wanting to keep a son at the same school past kindergarten (a transfer becomes necessary)
Explore Other Schools
- American School in Japan (ASIJ)Chōfu
- Tokyo Metropolitan Kokusai High School (Kokusai-kō)Meguro-ku
- Tokyo International School (TIS)Minato-ku (Mita)
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