Examining the motivational development of Japanese language learners, this book investigates the relationship between their future self-image as Japanese speakers and their broader self-image as multilingual individuals. The book compares two groups of Japanese language learners, one from Australia and the other from South Korea. Questioning how motivation is influenced both by native languages and by the other languages which learners speak or study, Toshiyuki Nakamura uses dynamic systems theory (DST) to uncover how knowledge of English in these different contexts motivates the learning of Japanese. Employing the concept of 'domain of possible selves' as an analytical framework, the book also provides a detailed description of the development of the learners' visions of themselves as users of Japanese and uncovers various aspects of Japanese language learners' L2 self.