Bloody Mary is a shojo manga by Akaza Samamiya. It began its serialization in the monthly manga anthology Asuka in November 2017, and ended February 2017, with ten volumes total. Viz Media has licensed it for English release.
Mary, a vampire with a death wish, has spent the past 400 years chasing down a modern-day exorcist named Maria who is thought to have inherited “the Blood of Maria” and is the only one who can kill Mary. Unfortunately for Mary, Maria doesn’t know how to kill vampires Desperate to die, Mary agrees to become Maria’s bodyguard and protect him until Maria can find a way to kill him.