My Dear Curse-Casting Vampiress (Manga) Vol 01

The world is full of vampires. Supernatural creatures who drain the blood from humans without mercy-fighting such beings is the foundation of Isuzu Osaka's life. But humanity is losing the war, and so desperate times call for desperate measures...And so, Isuzu sets out to strike a deal with a powerful vampiress whose beauty drives all who gaze upon her insane in the hopes of protecting his friends... Yen Press
(W/A) Chisaki Kanai