The internationalization of higher education institutions has grown parallel to an increasing need to foster an interculturally competent workforce. In Japan, efforts to internationalize have focused primarily on mobility programmes, often neglecting the impact of internationalization-at-home initiatives. Yet, while numbers of incoming international students continue to increase, the number of Japanese students going abroad in mid- to long-term programs is decreasing. This article describes a PhD project aiming to address gaps in the literature by investigating the impact of at-home strategies on domestic students’ intercultural competence, ultimately contributing to the optimization of programs that promote meaningful interaction between domestic and international students.