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Languages taught at Horizon Sendai are English and Japanese. English is used for a substantial portion of core instruction, with Japanese used for other subjects and daily life within a bilingual framework. The school provides language support for non-native speakers, including interpretation support for parent–school communications and access to English-language learning materials in the library. The site does not specify other foreign languages, nor formal language courses beyond English and Japanese, or explicit language levels (beginner to advanced).
Horizon Sendai Primary School provides a bilingual learning environment in English and Japanese. Approximately 50–60% of instruction is delivered in English, with the remaining lessons taught in Japanese. Classes are led by a co-teaching team of an international teacher and a Japanese teacher, creating a natural bilingual atmosphere in the classroom and in daily school life. All school communications are provided in both English and Japanese to support families who do not speak Japanese.
Horizon Sendai operates an English immersion program as part of its IB Primary Years Programme framework. About 50–60% of instruction is in English, with Japanese and English homeroom teachers in each class and English instruction delivered in level-based groups. Subjects such as Mathematics, Science, Art, Life Studies, Integrated Studies, and ICT are taught in English or through a bilingual English–Japanese approach. The school is designated by Japan's Ministry of Education as a Special Curriculum School to implement English immersion across core subjects.
Horizon Academy Sendai Campus offers two stages: an Early Learning Centre for ages 3–5 and a Primary School for Grades 1–6. In the Early Learning Centre, the school describes its curriculum as based on the UK’s EYFS framework, with inquiry-based experiences in English. In Primary, the school states that it implements the International Baccalaureate Primary Years Programme (IB PYP) and is a PYP authorized school, with 50–60% of instruction in English and both Japanese and English homeroom teachers. The campus is located in Takamori, Sendai and the school describes the setting as a peaceful residential area surrounded by nature. Practical supports listed on the site include a school bus service and daycare options.