OMG, trois compagnons de pacte dans mon dortoir

A human girl Isabel arrives at a magical academy to bring glory to mankind. By chance, she forms bonds with the three most powerful beings at the school—a vampire and two werewolves—and ends up assigned to the same dormitory as them. As the three beast-men grow increasingly committed to her, she moves closer to her dream of restoring humanity's prestige. However, she soon discovers that her own older sister, along with the organization behind her, appears to be orchestrating a much larger conspiracy…