Ai no Dai 6 Kan contains three hit singles, all released prior to the album between April and December 2004: "Roman: My Dear Boy", "Joshi Kashimashi Monogatari", and "Namida ga Tomaranai Hōkago". Ai Kago and Nozomi Tsuji (who graduated from the group in August 2004 to continue with their duo W (Double You) full-time) perform along with the other 12 members of the group at the time on the first two aforementioned tracks, recorded and released as singles when they were a part of the group, and on "Ship To The Future", a song from Morning Musume's Spring 2004 Musical Help!! Atchii Chikyu o Samasunda. Another album track, "Help!!", is also from Help!! Atchii Chikyu o Samasunda; a slower version of the latter was recorded by band members Rika Ishikawa and Sayumi Michishige under the nameEcomoni and released on the compilation Petit Best 5.
The album was released at a pivotal and transitional time for the group, as upon its release in December 2004, it was already known that first generation member and group leader Kaori Iida and fourth generation member, Rika Ishikawa, would be leaving the group within three months of each other — Iida to embark on a solo career and Ishikawa to concentrate on her new group V-u-den.
Ai no Dai 6 Kan is also Mari Yaguchi's last album with the group, although she continues to work as a general entertainer under the Hello! Project banner that houses Morning Musume and its many offshoots.
A new version of the album track "Chokkan: Toki to Shite Koi wa", entitled "Chokkan 2: Nogashita Sakana wa Ōkiizo!" and featuring some different lyrics as well as new vocals by the post-Mari Yaguchi lineup, is the title track of Morning Musume's 28th single release. A live recording of the original version of "Chokkan..." was released on December 21, 2005 on the Hello! Project compilation Petit Best 6. The first pressing of album came in special packaging with a B3-sized special poster and Hello! Project Photo Card No. 0084.
All songs written by Tsunku
- "Namida ga Tomaranai Hōkago" (涙が止まらない放課後?, "After School When Tears Won't Stop") – 3:46
- "Sukiyaki" (すき焼き?) – 3:05
- "Haru no Uta" (春の歌?, "Song of Spring") – 4:16
- "Joshi Kashimashi Monogatari" (女子かしまし物語?, "The Story of Noisy Girls") – 6:00
- "Chokkan: Toki to Shite Koi wa" (直感～時として恋は～?, "Intuition: Sometimes Love Could Be") – 4:15
- "Dokusen'yoku" (独占欲?, "Desire to Monopolize") – 3:46
- "Lemon Iro to Milk Tea" (レモン色とミルクティ Remon Iro to Miruku Ti?, "Lemon Color and Milk Tea") – 3:31
- "Roman: My Dear Boy" (浪漫 〜MY DEAR BOY〜?, "Romance: My Dear Boy") – 3:56
- "Koe (声?, "Voice") – 5:36
- "Help!!" – 2:28
- "Ship! To the Future" – 3:33
- "Joshi Kashimashi Monogatari 2" (女子かしまし物語２?, "The Story of Noisy Girls 2") – 5:08