[3] Established as a trust in 1988 to meet the needs of parents who wished their children to receive a British style education in Tokyo, BST was officially opened by Margaret Thatcher in September 1989 with 63 students and rapidly expanded.

To address the issue of inadequate facilities, part of the school was moved in August 2006 to newly renovated accommodation on the campus of the Showa Women's University, located a 10 minute bus ride away to the west of Shibuya station.

The Showa campus underwent construction during the summer of 2017 to accommodate the rising number of students joining the school, adding new classrooms, libraries, study areas and more.

BST Showa offers educational provision from Year 4 to 13 for over 620 students with extra-curriculars, such as sports fixtures and music clubs.

Throughout the whole school, BST offers a large range of subjects, including English (Language and Literature), Numeracy, Sciences, ICT, Wellbeing, History, Geography, Art, Drama, Photography, Economics, Business Studies, Music and Physical Education, all of which are offered at IGCSE and A Level.

[7] BST offers a range of competitive and recreational sport, with morning or after-school clubs available throughout the school year.