The International School of the Sacred Heart was established as the first international school for girls in Tokyo.
Pioneers in girls’ education in Tokyo since 1908, the International School of the Sacred Heart is the forerunner in providing a whole-person and well-balanced education for the international community in Tokyo.
Cultivating kindness and compassion, educating internationally minded citizens, and ultimately preparing young women with courage and confidence for the future: this is our expertise and our dedication.

Seisen International School is first and foremost a Catholic international school. Our Guiding Statements are key drivers in all aspects of life in Seisen International School and are responsive to the nature of the community.
While having a Catholic Christian foundation, our Guiding Statements are considered to be universal in purpose and intent. They echo our holistic approach to education both academic and moral, and they are deemed appropriate for our diverse representations of learners, nationalities, cultures, identities and faith communities in our school community.
Seisen 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.
Our guiding principles are based on the tradition of learning and service handed down from St. Raphaela, the founding member of the Handmaids of the Sacred Heart of Jesus.
Educate women for social and cultural transformation
Nurture faith development
Shape international mindedness and celebrate diversity
Side with the poor
Reach out to the world with hospitality and hope
Act as leaven for worldwide community building
Reverence creation
Share all that we are and have

SMIS is a boys school in Tokyo. A St. Mary's education nurtures the intellectual, physical, emotional, and social development of each student. SMIS offers a challenging array of core curricular and extra-curricular programs designed to enable the student to achieve excellence and success. SMIS fosters multi-cultural awareness and understanding, and encourage students to develop a sense of global responsibility and citizenship.