Gentlemen's alliance +, vol. 1 (Viz Media)

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." Haine has been in love with Shizumasa Togu since she read the fairy tale he wrote as a child. However, the Emperor is so well sequestered żeby the student council that she hasn't been able to speak to him in the three months she's been at the academy. And as rumour has it, he already has a lover...