Japanese games have received extensive attention in academic and non-academic research. However, there has been a noticeable lack of study on Japanese adult games, despite their significant presence within the industry. Given the growing popularity of adult games in the Western market in recent years and the increasing incorporation of gender and sex studies in gaming research, it is crucial to investigate this overlooked aspect of gaming.This thesis aims to conduct a comparative study of Japanese adult games, recognizing their unique significance and contrasting presence with the Western gaming landscape, where adult games have not gained the same level of prominence as in Japan. The research will explore the underlying reasons for this disparity and employ an ethnographic approach, incorporating interviews and surveys, to uncover the cultural, economic, and societal factors that have contributed to the existence of this anomaly.