The Gentlemen's Alliance †(2004)

Shinshi Doumei Cross

In return for a business loan of 50 million yen, the prestigious Kamiya family gave their daughter Haine away to the Otomiya family. Haine, now an Otomiya, is appointed to the student council of the exclusive Imperial Academy, a private school for the aristocracy. Even though Haine is of proper lineage to be on the council, she finds herself struggling to find her place among the many secrets of its elite members, especially those of the president who holds her heart--Shizumasa Togu, aka "the Emperor."

(Source: Viz Media)

Included bonus stories:

Volume 1
- Hydrangea, the Unspoken Love Veiled by the Rain

Volume 4
- The Labyrinth of Maora's First Love
- I Walk the Night
- On Monday I Fell in Love with You
- The Postman's Delivery Diary
- Go for It! Riko's☆First Love Story!!

Volume 5
- Kusame, Komaki, and the Key to Their Love
After Komaki confesses and Kusame accepts unwillingly, Kusame tries to break up with her, but how?

Volume 6
- Haine is My Sister!

Volume 7
- Maora's Mind Oracle Generation☆

Volume 8
- The Love Labyrinth
- Together with Okorimakuri-kun! 1
- Together with Okorimakuri-kun! 2

- Shoujo Eve Ringo Jikake no 24 Ji (Shojo Eve: Eve's Applework 24 Hours, 少女イブ☆林檎じかけの２４時)
"Kawaii”... Eve has come to hate this word. "Kawaii" has ruined her life and made her a social outcast. Yet she still has hopes Niikawa will return her feelings for him, that is if the rowdy class idol Kashii doesn't spoil everything first!

Volume 9
- Strawberry Milk and Chocolate Coffee

Volume 11
- Shinshi Doumei Cross Special Side Story

- Umi no Chikyuugi Nocturne (The Globe of the Sea ● Nocturne, 海の地球儀・夜想曲 (ノクターソ))
Searching for the meaning of people's lives is the mission that is given by God. The reason for my birth... It's okay if it was just to meet you that night.

- The Water-Bubble Princess