Key facts
Age range 3–18
Grades K–12
Gender Girls
Faculty —
Students 500–700
Tuition ¥1,300,000 – ¥2,370,000

Seisen International School (SIS)

Est. 1949
Tokyo IB DP (Diploma Programme) IB MYP (Middle Years Programme) IB PYP (Primary Years Programme) Catholic (Sponsored by the Handmaids of the Sacred Heart of Jesus). Welcomes students of all faiths. IB World School (PYP, MYP, DP), Japan Council of International Schools

School at a Glance

Age Range 3–18
Grades Offered K–12
Gender Girls
Total Students 500–700
Faculty —
Classes per Grade —

Seisen International School (SIS), founded in 1949 and located in Yoga, Setagaya city, Tokyo, is a distinguished private Catholic day school serving the international community. It is a full IB Continuum World School (PYP, MYP, DP) with consistently high academic results.SIS is a girls-only school from Grades 1–12, being co-educational only in Kindergarten. This all-girls environment is unique in fostering strong leadership and high participation in fields like STEM among young women. The school hosts approximately 700 students from over 40 nationalities, emphasizing high diversity and a focused, supportive community rooted in Catholic values. Key features include an exceptional 8:1 student-to-faculty ratio, and comprehensive support services, including specialized Learning and Language Support (using the WIDA framework) and social-emotional counseling, ensuring every student can thrive. Admissions follow a Rolling Admissions model.

Fees & Value

Base Currency ¥ (Japanese Yen)
Annual Tuition ¥1,300,000 – ¥2,370,000

Enrollment Fees

  • Application Fee: ¥20,000
  • Registration Fee: ¥300,000
  • Deposit: ¥500,000

Additional Fees

100,000

Campus & Facilities

Library Science Labs Cafeteria School Bus Playgrounds / Outdoor Areas

Sports Facilities

Gymnasium, Outdoor Sports Field, 2 Tennis Courts

Arts Facilities

Art studio, Music room, Design studio

Technology

Design Tech room, computer lab

Learning & Curriculum

Curriculum IB DP (Diploma Programme), IB MYP (Middle Years Programme), IB PYP (Primary Years Programme)
Diplomas / Certificates IB Diploma, High School Diploma
Languages English
Student Support University Counseling • SEN Support

Extracurricular Activities

Sports & Athletics : Basketball, Cross-country, Soccer, Tennis, Track & Field, Volleyball.
Academic & Leadership development : Debate, the International Science Competition Team, Model United Nations (MUN), Newspaper, Speech, and dedicated Service Learning projects.
Fine Arts : Choir, Drama, Pottery, and Yearbook.

Admissions

Application Process

Complete and submit the official application form.
Pay the non-refundable ¥20,000 Application Fee.

Entry Requirements

Placement Test, Student Interview, Parent Interview

Assessment Tests

School Designed Test

Interview Process

Zoom Interview with Principal

Deadlines

Rolling Admissions system

Required Documents

Passport, visa/residence status documentation, and immunization/health records

Contact & Location

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