Ouran High School Host Club

The Door the Twins Opened (1x20)

Air date: Aug 15, 2006

A prequel that tells the story of how the twins were convinced to help form the club, including the "Which One is Hikaru?" game that they always played, including their past with the maid who led them to believe that no one would ever be able to tell them apart, and the cruel trick that they played on a girl in middle school.