St. Mary's International School

What St. Mary's International School does

St. Mary's International School is a private, all-boys Catholic international school located in Setagaya, Tokyo, operated by the Society of Mary (Marianists) since its founding in 1954. It serves students from elementary through high school with an IB curriculum, alongside the standard WASC and CIS accreditations that credential it for globally mobile and expatriate families. The student body is described as representing nearly 50 nationalities, and the school actively participates in the KPASS inter-school athletic league.

The core commercial offering is a tuition-funded K-12 day education priced at ¥2,860,000 (Elementary) to ¥3,050,000 (High School) per year, supplemented by one-time application (¥50,000), registration (¥400,000), and development fund (¥1,000,000) fees. A separate Summer School program extends the offering into a seasonal, mixed-gender segment. The underlying operating platform combines standard international-school EdTech — Blackbaud for advancement, ManageBac for curriculum and reporting, FinalSite for web/communications, and Naviance for college counseling — with traditional in-person instruction at the single Setagaya campus.

Revenue is generated through tuition, ancillary fees, Summer School tuition, donations, and community programs supported by an Alumni Association, parent association (SMAA), and Booster Club. As a non-profit, the institution does not disclose financials publicly; the school is not a venture-backed entity and does not operate a for-profit pricing or go-to-market motion. Strategic positioning is anchored on accreditation stack, religious identity, and community ecosystem rather than on rapid expansion or technology differentiation.

Name

St. Mary's International School

Legal name

St. Mary's International School

Website

https://smis.ac.jp

Company type

Private

Founded year

1954

Operating status

Operating

Short description

St. Mary's International School is a non-profit, all-boys Catholic K-12 international school in Setagaya, Tokyo, founded in 1954. It serves a globally mobile student body of nearly 50 nationalities under WASC, CIS, and IB accreditations, funded primarily through tuition and community donations.

Ownership category

akta.pro rank

Product category

K-12 International Education

NAICS

Elementary and Secondary Schools (611110), Elementary and Secondary Schools (6111), Educational Services (611)

SIC

Services-Educational Services (8200)

akta.pro primary industry

International/Global Curriculum Schools (IB, Cambridge, etc.) (EDAJABAG)

akta.pro secondary industries

Faith-Based (Religious) K–12 Schools (EDAJABAC), Single-Sex (Boys/Girls) Private Schools (EDAJABAK), Overseas Summer School Programs (Secondary) (EDAIAHAC)

Keywords

• K-12 education
• International school
• IB diploma program
• College preparatory
• Catholic education

Headquarters

HQ city

Tokyo

HQ country

Japan

HQ region

Asia

Offices1 record

Markets served

GTM type

B2C

Offering type

Services

Cost components

Personnel, Operations, Infrastructure, Technology or R&D, Marketing or Sales, Others

Revenue model

1. Tuition: Primary revenue stream from tuition fees charged annually by school level (Elementary, Middle, High School). Tuition is set by the Finance Committee and approved by the Board of Directors.
2. Application and Registration Fees: One-time non-refundable fees including Application Fee (¥50,000) and Registration Fee (¥400,000) charged to newly entering students.
3. Development Fund: Capital contribution of ¥1,000,000 required from new students to support school infrastructure and programs.
4. Summer School Programs: Summer school programs offering courses across all grade levels (RP-Grade 12) with pricing based on course blocks. Both boys and girls ages 5+ are welcome.
5. Transportation Services: School bus service with one-way and round-trip options, providing additional revenue stream.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels5 records

Core offering

St. Mary's International School is a non-profit Catholic all-boys international school in Tokyo delivering a K-12 college-preparatory education from Readiness Program (kindergarten equivalent) through Grade 12. The standards-based curriculum is aligned with American, IB, and international standards, supported by the IB Diploma Programme, comprehensive Fine Arts (music, visual arts, drama), an Athletics program of nearly 40 KPASS teams, and specialized services such as university counseling, English language support, and safeguarding. Tuition is set annually by the Finance Committee and approved by the Board of Directors.

Product overview

St. Mary's International School is a non-profit, all-boys Catholic international school in Tokyo offering a comprehensive educational program from Readiness Program (kindergarten equivalent) through Grade 12. The school provides a holistic education structured around three pillars: academics, arts, and athletics. The core academic program follows standards-based curricula aligned with American (Common Core), IB, and international standards, featuring specialized programs including the IB Diploma Programme, comprehensive fine arts (14 music groups, visual arts, drama), and athletics (nearly 40 teams). Supporting programs include Summer School, University Counseling, Student Support Services, Library Services, and Safeguarding/Child Protection. The school is accredited by WASC and CIS, with technology integration including 1:1 device programs (iPads for Grades 3-5, MacBooks for Middle School, laptops for High School).

Differentiator

Problem solved

Functional benefit

Products and services

• Elementary School Program (Grades RP-5) A comprehensive educational program for students from Readiness Program (kindergarten equivalent) through Grade 5, featuring core subjects (Language Arts, Math, Science, Social Studies, Religion) and special subjects (technology, art, PE, swimming, music, library, Japanese), with a 1:1 iPad program for Grades 3-5. Targeted at families seeking an international, all-boys elementary education.
• Middle School Program (Grades 6-8) A college-preparatory curriculum for early adolescent boys in Grades 6-8, featuring core academic subjects, extensive extracurricular activities and electives, and a required MacBook Air program for all students. Targeted at families seeking college-preparatory middle school education in an all-boys international setting.
• High School Program (Grades 9-12) A college-preparatory program for Grades 9-12 offering a comprehensive academic curriculum, university counseling services beginning in Grade 10, and a BYOD laptop requirement for all students. Includes homerooms of approximately 15 students for personalized support, and integrates IB Diploma preparation. Targeted at families seeking rigorous international college-preparatory education for grades 9-12.
• IB Diploma Programme International Baccalaureate Diploma Programme for students aged 16-19, offering six subject groups (Studies in Language and Literature, Language Acquisition, Individuals and Societies, Sciences, Mathematics, and The Arts) with core components of Theory of Knowledge, CAS, and Extended Essay. Targeted at High School students preparing for global university admission.
• Athletics Program Athletics program featuring nearly 40 teams across all grade levels competing in the KPASS league, offering Fall, Winter, Spring, and Year-Round sports including Cross Country, Soccer, Volleyball, Basketball, Futsal, Rugby, Wrestling, Weightlifting, Baseball, Tennis, Track & Field, and Swimming. Targeted at students seeking competitive athletic development alongside academics.
• Fine Arts Program A comprehensive Creative and Fine Arts program including 14 music groups (choirs, bands, jazz ensemble), Visual Arts (painting, drawing, ceramics, printmaking, mixed-media), and drama opportunities from Elementary through High School, with participation in all KPASS league arts competitions and festivals. Targeted at students seeking creative and artistic development alongside academics.
• Summer School Program Annual summer program offering over 40 courses across all grade levels (RP to Grade 12), including academic, athletic, artistic, and enrichment activities. Open to both boys and girls ages 5 and up, including non-St. Mary's students. Targeted at families seeking short-term summer enrichment programming.
• Summer Adventure Program Summer program providing educational and recreational activities for younger students during summer months. Targeted at families seeking summer programming for elementary-age children.
• University Counseling Comprehensive university counseling program starting in Grade 10 with standardized testing support, IB course selection guidance, family conferences, weekly presentations on post-secondary options, Career Day events, and partnerships with the St. Mary's Alumni Association. Targeted at High School students and families preparing for global university applications.
• School Bus Transportation Service School bus transportation service with one-way (morning or afternoon) and round-trip options. Priced annually per route. Targeted at enrolled families needing daily transportation to and from the Setagaya campus.

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration17 records

Feature2 records

Partnerships

Six partnerships are on record, tiered core and minor.

• Kanto Plain Association of Secondary Schools (KPASS)coreStrategic or Co-development PartnerKPASS is a regional athletic and activities league for international schools in the Kanto Plain area. St. Mary's is one of the few KPASS member schools to fully participate in all league competitions, festivals and events throughout the academic year. Nearly 40 Titans teams compete in KPASS across various sports.
• Council of International Schools (CIS)coreOthersCIS is a membership organization of international schools around the world. St. Mary's is fully accredited by CIS, which provides standards and procedures for school improvement through five-year reviews.
• International Baccalaureate Organization (IBO)coreOthersIBO authorizes St. Mary's as an IB World School to offer the IB Diploma Programme, a globally recognized pre-university program designed to give students competitive edge for university studies.
• Western Association of Schools and Colleges (WASC)coreOthersWASC is one of six regional associations that accredit public and private schools, colleges and universities in the United States and East Asia. St. Mary's is fully accredited by WASC.
• Cezars KitchenminorOthersCatering service provider for school meals and snacks. Operates Cashless Cafeteria system for student lunch service.
• St. Mary's Association Tokyo (SMAA)coreOthersAlumni and parent association that supports school events including Carnival, Senior Cheer traditions, and community engagement activities.

Scale indicators7 records

Recent moves6 records

Expansion highlights4 records

Direct peers

• American School in Japan (ASIJ): ASIJ is the flagship American international school in Tokyo serving K–12 with co-ed enrollment, IB programmes, and similar tuition pricing. ASIJ competes directly for the same international, university-prep families in the Tokyo metropolitan area.
• International School of the Sacred Heart: A Catholic all-girls international school in Tokyo also founded in the post-war era. It is a direct mirror peer to St. Mary's — same Catholic mission, similar IB curriculum, comparable tuition, and identical K–12 international positioning.
• Seisen International School: Catholic girls' international school in Tokyo offering IB PYP/MYP/DP and similar tuition band. Competes for the same Catholic-international-family segment, and is also referenced in St. Mary's leadership biographies.
• British School in Tokyo: Premium co-ed British international school in Tokyo following the English national curriculum with IGCSE/A-Levels. Targets the same expatriate and affluent Japanese international families at comparable tuition levels.
• Aoba-Japan International School: Co-ed K–12 international school offering IB continuum (PYP/MYP/DP). Operates multiple Tokyo campuses and competes aggressively on curriculum breadth and pricing in the same international family segment.
• Nishimachi International School: Long-established co-ed international school in central Tokyo with strong Japanese-language immersion programme. Targets the same culturally diverse, internationally mobile families at similar premium pricing.

Regional players

• Yokohama International School: Co-ed IB World School serving K–12 in the Greater Tokyo/Yokohama area. Comparable curriculum (IB continuum) and tuition band, with a slightly broader geographic catchment area.

Emerging players

• Tokyo International School: Smaller, newer IB-continuum school in central Tokyo. Competes for younger international families at the elementary level with a more progressive, project-based curriculum.
• Canadian International School (CIS Tokyo, rebranded to Tokyo International School of Canada): Co-ed K–12 international school in Tokyo offering IB and Canadian curriculum tracks. Direct curriculum overlap with St. Mary's and competitive in the same premium expatriate segment.

Others

• Friends of St. Mary's International School (US 501(c)(3)): US-based non-profit foundation supporting St. Mary's fundraising and alumni/parent engagement from North America. Ecosystem / capital-formation partner rather than a competing operator.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/c/StMary'sInternationalSchoolTokyoJapan
• Facebookfacebook.com/StMarysTitans
• Instagraminstagram.com/stmarys_titans

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles7 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about St. Mary's International School