This Vampire Won't Give Up!, Volume 4

At last, Minami and Hokuto are bound together in body and soul. Minami enthusiastically thought, "I'm so happy! I can do my best at work, too!" Then, Hokuto's father, who was the reason she loved vampires, appears before her?! Along with Hokuto, she is invited to the family Halloween party held at their villa...?! In the midst of the throng of speculation and seduction, Minami's love for Hokuto is tested!!