18: Eighteen is the debut studio album by Nana Kitade.

The first press editions of the album included a ticket to the live show and handshake event.

On December 7, she released a DVD called Nana Kitade: 18Movies.

The DVD consists of all her music videos up until this point, clips from her one-man live show, commercials for her releases, and a studio recording of "Kesenai Tsumi".

The album was released in the United States on July 11, 2006 through Tofu Records due to increased popularity overseas.