Wholesale Black Bird, Vol. 1 by Kanoko Sakurakouji

[Viz] A mythical, paranormal romance that has sold through over 290,000 copies in the U.S. There is a world of myth and magic that intersects ours, and only a special few can see it. Misao Harada is one such person, and she wants nothing to do with magical realms. She just wants to have a normal high school life and maybe get a boyfriend. But she is the bride of demon prophecy, and her blood grants incredible powers, her flesh immortality. Now the demon realm is fighting over the right to her hand...or her life! Everything changes one day when Misao is attacked by a demon. Her childhood friend Kyo suddenly returns to save her and tend to her cuts--with his tongue! It turns out Misao is the bride of prophecy, whose blood gives power to the demon clan who claims her. But most demons want to keep her power for themselves--by eating her! Now Misao is just trying to stay alive...and decide if she likes it when Kyo licks her wounds.