This article aims to research the process of international migrants’ adaptation in terms of the interactive communication between migrants and their host society, using the concepts of “social cohesion” and “integrative communication theory” as communicative methodologies. This study intends to explore the new paths for global migrants’ adaptation through such an investigation through the case of a migrant community in Japan. The significant theoretical issue in the research on the adaptation of global migrants is the discussion of the “segmented assimilation theory” proposed by Portes and Zhou (1993). Assimilation theory is fundamentally a one-way approach, as its perspective is essentially placed on only the host society. Thus, the authors deem it necessary to research the adaptation of international migrants in different dimensions. This research employed an ethnographic approach to collect qualitative data at the research site in Tokyo, where the most significant migrant community in Japan is located. The data collection methods include fieldwork visits, interviews, and participant observation between 2020 and 2022. The study applied a communicative approach to the migrants’ adaptation, focusing on the interaction with the host society and on the experiences of individual migrants. Results particularly point to if there is a certain extent of ethnic strength in the host society, even if migrants experience rejection, it helps foster positive communication with locals and the host society. However, it was also found that for this to be the case, a certain degree of acceptance experience is necessary, and it is essential that the host society has an openness to strangers. Moreover, such a research framework allows us to examine the possibility of transcending the limitations of categorical views such as “adaptation/ non-adaptation” of migrants in host society