This paper focuses on the grammatical category of voice in the context of Japanese language teaching and aims to analyze the categories of the passive and the causative starting from the academic experience at Bologna University. The study provides a broad theoretical framework on the basis of the recent Japanese literature on linguistics (nihongogaku) in order to stimulate a double intralingual and interlingual reflection in Italian students. At a didactic level, the contribution underlines the importance of drawing on Japanese literature in order to acquire a shared metalanguage that can stimulate further research and induce teachers to keep up with the most recent outcomes in the field.