Yui Komori is an ordinary high school girl who aspires to be a vampire hunter and strives to register for the vampire hunter exam.
One day, her father, a priest, disappeared.
One day, someone from the Holy See brought her a letter from her father, in which she was asked to stay with a family named Nijuan.
Therefore, Komori-san, who is determined to be a vampire hunter, has to move into the vampire's nest...
Yui Komori: Just move to a vampire's den. What about future blood hunting? She just treated it as an internship in advance, but how can this vampire den produce NC model S-level BT vampires? ?
Yui Komori: Brother Nijuan, don't give up taking medicine~~