Episode 76

Key and Noah's Door (鍵とノアの扉, Kagi to Noa no Tobira)  is the 76th episode of the D.Gray-man (Manga) anime adaptation.

Summary
Allen, Lavi, Krory, Kanda and Chaoji follow Lenalee into the portal, leading them into Noah's Arc. The Millenium Earl speaks through Lero, telling the group that the old Arc will be completely destroyed in 3 hours. Lero tells them that as the Arc is no longer connected to the other dimensions, there is no exit. While this is happening in the sky above, the exorcists left behind are attacked by a herd of giant akuma sent by the Earl.

Tyki appears in the Arc to give the group a way out. He wagers the key to an exit against their lives. They must use Road's key to find the correct door that is a portal to the exit. Through the first door the try, they run into Skinn Bolic, who Kanda stays behind to fight.