This book explores encounters and interactions between international students and local civil society organizations (CSOs) in Japan. Based on the results of a cross-case analysis, this study reveals the possibilities for international students in Japan of creating social capital in the short term in culturally and socially diverse groups. While a conventional approach sees universities as the main support providers, this research shows the role of local CSOs as alternative actors offering international student support. Unlike the long-standing paradigm viewing Japanese civil society as top-down and closely following the government, this book uncovers many decentralized and bottom-up organizational types. Furthermore, it highlights an active part taken by foreign staff and volunteers in Japanese CSOs, which challenges the guest–host dichotomy of the previous literature. Presenting a reconsidered insight into the role of international students and their interaction with CSOs in community building, this book will appeal to students and scholars of Asian studies and migration studies as well as organizers of CSOs and faculty of international higher education institutions.