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Seisen Crest

A Catholic Kindergarten to Grade 12 IB international school in Tokyo

Preparing global leaders, critical thinkers and compassionate women for tomorrow.

Our Stories

Learning to Love, Loving to Learn since 1962

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Mary Chu, Seisen Former Students's Association President

“Every memory of Seisen is wonderful which includes the Sisters, my friends, teachers, staff, classes, participating in extracurricular activities, and being involved at school.  What they all have in common is that as a child and student, I knew that I belonged at Seisen.  As students, we always accepted each other even for our differences in culture, religion, and opinions.  We didn’t judge and were never judged.  I’m grateful to my parents for choosing Seisen for me since Seisen is a big part of who I am today."

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Ms. Grantham, P.E.

"I have been a physical educator for 20 years. As a physical educator, I believe in and I am committed to bringing out the best in all my students and to develop them holistically through fun, engaging and enjoyable health and physical education activities. My love for children and my passion for teaching stems from my early childhood days of using my vivid imagination to pretend that I am a teacher giving instructions, often using my sibling (who politely obliged each time), as a student. Growing up in Singapore and being surrounded by the lush greenery in my garden city often gave my parents opportunities to expose me to the outdoor environment where tree climbing and ocean swimming were great weekend escapes from the hustle and bustle of a busy Singaporean lifestyle. As such, my love for physical activity and sport was developed from a young age and it has been my commitment and mission to pass that on to my students, knowing that I can impact upon them so positively.

It has always been a dream of mine to teach and live in Japan. The fascinating beauty and culture of the place, people and food has always been so appealing to me. When a position was made available at Seisen International School, I immediately looked at the Seisen mission and identified with how as a Catholic teacher, I am able to embody the spirit of Christ to support students in developing their unique talents in becoming 'competent and compassionate players in our global society' especially through PE and sport. As an international school educator, I feel privileged to work with remarkable students and staff from diverse backgrounds and my calling has brought me to Seisen International School with the aim of 'empowering my students through the shared responsibility' we have as teachers.

I am excited and blessed to be a part of the Seisen International School community and my journey has only just begun!"

Tsuji Family

As an international school graduate and father of two boys , I have gotten to know Seisen and its environment from many angles throughout the years. I share many precious memories with Seisen graduates and have been blessed to get to know the faculty and staff after enrolling both my sons in Seisen kindergarten. My wife and I wanted my eldest son to experience a Montessori education before St.Mary’s and my youngest son is currently following in his footsteps. I was delighted to see both my sons enjoy and learn so much in Seisen’s unique environment and am grateful to share this special experience with them. Seisen’s education system had always impressed me as a student, and now as a father, I feel the curriculum has kept evolving and enhancing year after year. Needless to say, I have utmost faith in Seisen’s highly trained and experienced teachers who continue to provide a priceless education to all. 

We love Seisen and are proud to be a part of the greater Seisen family!

Facts & Figures

The Seisen Story

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55+

Nationalities represented by Seisen Students

ib world school

3

International Baccalaureate Programmes Offered

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25

Nationalities represented by Seisen Faculty

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22

Countries with Sister Schools founded by the Handmaids of the Sacred Heart of Jesus

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7:1

Student to Faculty Ratio

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3/3

Fall Sports Far East Championships won in 2019 (Tennis, Cross Country, Volleyball)

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1962

The Handmaids of the Sacred Heart of Jesus operated Kindergarten is relocated from Yoyogi to Gotanda.

1972

Move to new Setagaya campus in Yoga.

1974

Sister Asuncion Lecubarri, the new principal, awards diplomas to 18 students. Seisen's first graduating class.

1986

First girls school in Asia to offer the International Baccalaureate Diploma Program.

2007

International Baccalaureate Organization authorized Seisen to start the Primary Years Program. 

2012

Seisen International School celebrates it's 50th Anniversary.

2019

With the addition of the Middle Years Program Seisen becomes an IB Continuum School.

2021

Launch of the new school website.

2022

Celebration of our Diamond Anniversary.

Seiren International School in Tokyo logo in white

The Seisen Experience

Programs & Features

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News & Events

The latest school updates

All CAS’ed Out
All CAS’ed Out

Congratulations to the class of 2023 who have successfully completed the CAS program! This collection of reflections from the students highlights the important role CAS plays in the IB Programme.

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