This article examines the history, current legal status, cultural and religious perspectives, impact of westernization, public opinion and examples of Japanese people who have married their siblings. Marriage between siblings is strictly prohibited by law in Japan due to potential genetic defects or deformities that could result from such unions as well as social stigma associated with them. Public opinion towards marrying one's sibling is overwhelmingly negative throughout most parts of modern-day Japan. Despite this, there have been several cases of Japanese people who have managed to marry their siblings successfully despite facing extreme pressure from both their families and society at large.