School Profile
The Seisen Mission
Seisen International School, a Catholic International School, educates future world citizens to become men and women for others and with others, in the spirit of Jesus Christ.
Seisen’s mission is to provide a safe environment with a focus on the multi-faceted nature of community wellbeing. We seek to empower each student, through shared responsibility, creativity, and human interdependence, to develop their unique talents and to become competent and compassionate players in our global society, capable of empowering others and of bringing hope and peace to our ever-changing world.
Seisen International School (SIS) is a private, Catholic school for girls serving the international community in Tokyo.
The high school has 196 students out of a total K-12 population of 700 students representing over 40 nationalities. The aim of the high school program is to prepare young women for higher education through a comprehensive and challenging program of study.
The curriculum is taught in English and all students are encouraged to speak English within the school. Seisen International School has high expectations of its students in terms of both character development and academic achievement.
The faculty, principally trained in the U.S., the U.K., Canada, and Australia, is broadly international. Small class size and close faculty-student relationships promote a supportive atmosphere.
Our students participate in a wide range of extra-curricular activities including basketball, choir, cross-country, debate, drama, international science competition team, Model United Nations, newspaper, pottery, soccer, speech, tennis, track & field, volleyball and yearbook. As a member of the Kanto Plain Association, Seisen International School competes in academics and sports, and participates in fine arts with other international and DoDD schools.
IB Courses Offered for the Class of 2026-2027
GROUP 1: Language A
- English A Literature
- English A Language & Literature
- Japanese A Language and Literature
- School-Supported Self-Taught Language
(1 Mandatory English A)
GROUP 2: Language B or Ab Initio
- Japanese B
- French B
- Spanish B , Spanish Ab Initio
GROUP 3: Individuals and Societies
- Economics
- Geography
- History
- Psychology
GROUP 4: Sciences
- Biology
- Chemistry
- Environmental Systems & Societies
- Physics
- Computer Science
GROUP 5: Mathematics
- Mathematics: Analysis and Approaches
- Mathematics: Applications and Interpretation
GROUP 6: The Arts
- Music
- Visual Arts
Grade Distribution Notes
- Seisen does not calculate GPA or rank in class..
- Grades 9 and 10 follow the MYP framework.
- Students in grades 11 and 12 choose from three available pathways.
- Students are graded on a criterion-based 1-7 scale according to the IB grading system.
- Regarding predicted grades for IB TOK/EE: 2 points are predicted systematically for all candidates.
MATRICULATING STUDENTS
2020-2026 Graduates have attended over 100 institutions around the world.
Students are encouraged to apply to a maximum of 10 institutions.
Accredited by: Council of International Schools and New England Association of Schools & Colleges
External Examinations: International Baccalaureate (IB) SAT Reasoning & Subject Tests PSAT/NMSQT, Japanese Kanji Aptitude Tests