The Door the Twins Opened! is the 20th episode of the anime series. The backstory of how Hikaru and Kaoru Hitachiin become hosts is told, in which their insular upbringing is brought to light along with the tale of a household maid whose words and actions transform the toddler twins forever. Their social/emotional isolation from the world at large, their head games with other people and their conviction that everyone outside of themselves is an idiot changes the day a certain blond with a crazy idea approaches them with an invitation to join his newly-formed Host Club. They think Tamaki Suoh is foolish and funny but, over time, his innate wisdom regarding their situation becomes apparent and, in the end, the twins agree that joining his club might be interesting, after all.