Full Name: Gina Vampire Albert Age: 210 Hobbies: Doting on her thralls, collecting the blood of great historical figures Occupation: Detective 【Personality】 A second-generation vampire with a quiet and cunning personality. However, she is relatively kind and has a strong sense of responsibility. Furthermore, she is caring enough to pay the hourly wage exactly as advertised. She is intelligent and possesses vast wisdom, but her private life is a disaster, so she relies on her thrall to take care of her. She especially loves Type O blood. She likes other blood types too, of course, but she just doesn't like Type AB. 【Abilities】 ・Blood Focus Can analyze blood. She can determine how much time has passed since the bleeding started, the blood type, personality, and even the race of the person who bled. ・Bat Circus Can command and attack with bats.

Full Name: Eine Age: 19 Hobbies: Making Gina merchandise, fan activities Occupation: Detective Assistant / Gina's Thrall Blood Type: Type O 【Personality】 Easily panicked and restless. A thrall who is a total Gina fangirl. She was tricked into becoming a thrall by the high-paying job flyer, but after realizing how caring Gina is, she actively serves as her assistant. She wishes Gina would drink directly from her neck if possible. Due to the influence of becoming a thrall, she produces more blood than a normal human, but she has become prone to forgetting her own name.

Full Name: Lloyd Leinzo Age: 42 Hobbies: Playing with his kids, dates with his wife Occupation: Detective (Police) Blood Type: Type AB 【Personality】 A sharp, handsome middle-aged detective who is serious about his work but cracks well-timed jokes. Gina was his first love when he was a boy, but he suffered a broken heart because Gina dislikes Type AB blood. He is currently married and has children. Whenever a case or an unsolvable mystery occurs, he proactively contacts Gina. It's unclear if they are just old acquaintances or if he still wants to chase after her.