School Information
Seisen International School, established in 1962 by the Handmaids of the Sacred Heart of Jesus, is one of the schools under the Seisen Educational Institution. It begins with a coeducational Montessori kindergarten and continues as an all-girls school from Grade 1 through Grade 12, offering the International Baccalaureate (IB) programs: PYP, MYP, and DP.
Guided by the educational philosophy of “Love and Service,” over 100 international faculty members from 26 countries provide a safe and high-quality learning environment. Approximately half of the teachers hold a master’s degree, 4% hold a doctorate, and they bring an average of 18 years of teaching experience.
The school also excels in the arts and sports, and offers a learning environment that embraces and supports students from diverse cultural backgrounds.
Last updated year : 2026
Detailed Information
| School Name | Seisen International School | ||||||||||||||||||||
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| Phone Number | 03-3704-2661 |
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| Email Address | info@seisen.com |
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| Website | https://www.seisen.com/ | ||||||||||||||||||||
| Number of Campuses | 1 | ||||||||||||||||||||
| Campus | |||||||||||||||||||||
| School Type | Kindergarten / Elementary School / Junior High School / High School | ||||||||||||||||||||
| Number of persons, etc. |
Kindergarten
Capacity 210
Average number of classes (per grade level) 8
Average Class Size 25
Elementary School
Capacity 250
Average number of classes (per grade level) 2
Average Class Size 25
Junior High School
Capacity 150
Average number of classes (per grade level) 2
Average Class Size 25
High School
Capacity 200
Average number of classes (per grade level) 2
Average Class Size 25
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| Capacity (entire school) | 810 | ||||||||||||||||||||
| Admission Requirements and Selection Process |
Eligibility for the English-based curriculum will be determined based on the applicant’s educational background and language proficiency. |
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| Coeducational/Boys' School/Girls' School | Girl's School | ||||||||||||||||||||
| Instructional Language | English | ||||||||||||||||||||
| Primary Nationalities of Students |
Around 60 nationalities
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| School Year | August-July | ||||||||||||||||||||
| International accreditations held (WASC, CIS, ACSI, NEASC, Cognia, COBIS, etc.) |
CIS / NEASC |
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| Membership (WASC, CIS, ACSI, NEASC, Cognia, COBIS, etc.) |
CIS / NEASC IBO (International Baccalaureate Organization), JCIS (Japan Council of International Schools), EARCOS (East Asia Regional Council of Overseas Schools), etc. |
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| Curriculum | International Baccalaureate (PYP) / International Baccalaureate (MYP) / International Baccalaureate (DP) | ||||||||||||||||||||
| Tuition |
Kindergarten 2,500,000yen Kindergarten Half Day：1,500,000yen Kindergarten 2,500,000yen Kindergarten Half Day：1,500,000yen Contact each school to confirm the full cost of attending –some fees may not be listed here. |
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| Number of Teachers | 106 | ||||||||||||||||||||
| Sports Facilities | Sports Field：Available / Gymnasium：Available / Swimming Pool：Not Available | ||||||||||||||||||||
| School Bus | Available |
School Photos
