This article explores the cultural, legal, and social implications of dating a cousin in Japan. The term "cousin" (おい) refers to someone related by blood or marriage up to three generations removed, including first cousins, second cousins, and even third cousins. Historically, marriages between cousins were common during the Edo period (1603-1868), but modern laws have since banned such unions. While it is not illegal for two people related up to three generations removed to date each other in Japan, there remain strong social taboos surrounding such unions which can make them difficult for some couples to navigate through successfully without facing judgement from others. Ultimately it comes down to personal preference and comfort level when making decisions about relationships involving close relatives.