This study examines the influence of animosity, consumer ethnocentrism, and cosmopolitanism on Korean consumers' product judgment and purchase intention toward Japanese animation. Specifically, the research analyzed the moderating effect of nostalgia among Korean consumers in their 40s who have been exposed to Japanese animation since childhood. A survey of 200 Korean consumers in their 40s revealed that while animosity and consumer ethnocentrism negatively affected purchase intention, cosmopolitanism had a positive impact on both product judgment and purchase intention. Mediation analysis confirmed that product judgment mediated the relationship between cosmopolitanism and purchase intention. Additionally, nostalgia not only positively influenced purchase intention but also demonstrated a significant moderating effect on the relationship between consumer ethnocentrism and purchase intention. While previous studies on Korean consumers' purchase intention toward Japanese products focused on animosity and consumer ethnocentrism, this study contributes to the literature by incorporating cosmopolitanism as a key variable, reflecting contemporary consumer trends in Japanese animation consumption. By confirming the positive influence of cosmopolitanism and nostalgia on purchase intention, this study provides practical implications for marketing strategies of Japanese animation and its utilization as a soft power resource.