Seisen, a Catholic international school educates future world citizens to become men and women for others and with others, in the spirit of Jesus Christ. Our guiding principles are based on the tradition of learning and service handed down from Saint Raphaela Mary, the founding member of the Handmaids of the Sacred Heart of Jesus.
Our guiding principles: educate women for social and cultural transformation, nurture faith development, shape international mindedness and celebrate international diversity, side with the poor, reach out to the world with hospitality and hope, act a leaven for worldwide community building, reverence creation and share all that we are and have.

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.

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.