Many Japanese families live along the school's bus route in northern Barcelona.

[2] The Hoshuko Barcelona Educación Japonesa/Escuela de Educación Japonesa en Barcelona [ja] (バルセロナ補習校 Baruserona Hoshūkō), a weekend supplementary Japanese school, holds its classes in the Colegio Japonés de Barcelona building.

[4] Makiko Fukuda (福田 牧子, Fukuda Makiko),[5] a professor at the Autonomous University of Barcelona[6] and the author of Els usos lingüístics dels nens japonesos i nipocatalans/nipocastellans escolaritzats a Catalunya: el cas de l’alumnat de l’escola complementària de llengua japonesa i del col·legi japonès de Barcelona, stated that many students do not make sufficient progress in their foreign language instruction because they primarily have relations with other Japanese, have little motivation to learn the area language since they understand they will only be temporarily in Barcelona, and because of the few hours per week of foreign language instruction.

[7] Most CJB students have trivial amounts of Catalan language instruction for festivals and other symbolic reasons.

[4] Norio Sudo, the consul general of Japan in Barcelona, said that these parents are managers of Japanese companies.