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Seisen International School operates a single campus in Setagaya, Tokyo, serving Kindergarten through Grade 12 as an all‑girls Catholic IB school. The campus includes dedicated spaces for both learning and community life, including separate KG/ES Media Center and MS/HS Library with a catalog and access to digital resources. Academic spaces include science laboratories and a design technology area, along with music rooms, art rooms, and a drama room to support creative learning. The school provides a cafeteria, a multi‑purpose room, and a chapel on campus, alongside a gymnasium and outdoor facilities. Outdoor spaces include a field and tennis courts as well as multiple playgrounds suitable for different age groups. The campus supports a range of after‑school activities and student life programs.
The campus features a gymnasium for indoor sports and physical education. There is a field and tennis courts on site for team sports and outdoor activities. The site also includes multiple playgrounds for younger students.
Academic facilities include separate KG/ES Media Center and MS/HS Library with a library catalog and access to online resources. The MS/HS Library provides digital databases and online tools such as Britannica School, JSTOR, BrainPOP, and eBook resources via OverDrive and the Sora app. The campus map identifies dedicated Science Labs and a Design Tech Room, and the Arts spaces include Music Rooms, KG/ES and MS/HS Art Rooms, and a Drama Room to support visual and performing arts.
After-school activities are offered for elementary and secondary students, supported by dedicated spaces such as Music Rooms, Drama Room and Gymnasium. ES After School Activities and MS/HS Activities organize a range of programs and clubs on campus.
Seisen International School is a private Catholic school in Tokyo serving the international community, with a total K–12 population of about 700 students representing over 40 nationalities. Teaching is in English, and the school encourages students to speak English within the school. Seisen describes itself as an International Baccalaureate Continuum school, offering Montessori and the IB Primary Years Programme in Kindergarten, IB PYP in Elementary, IB MYP in Grades 6–10 and the IB Diploma Programme in High School. Facilities on the campus include science labs, a design tech room, music rooms, a drama room, library media centers, a chapel, a gymnasium and a field and tennis courts. Seisen also highlights service and leadership opportunities for students as part of school life.