Investigating the relationship between the English and Japanese proficiency of Japanese learners of English 論文 Akiko TATSUMI・Atsushi NAKAGAWA・Satoko NAKAHARA・Ryota NAGATA ·2025 ·『International Journal of Curriculum Development and Practice』 27(1) pp. 1-10 doi:10.18993/jcrdaen.27.1_1