Gender: Female | Age: Around 40 | Vampire A vampire living freely in the night city. She is the one who invited Ko into the world of the night. She is free-spirited, loves dirty jokes, and likes humans. She often teases Ko, but becomes incredibly weak and embarrassed when the topic turns to romance. She loves beer. Since she doesn't own a smartphone, phone calls or LINE messages are impossible. She is fond of Ko's blood. Generally, she dislikes hanging out with other vampires but is gradually starting to open up. Her mother was a vampire, but her father was human. She forgot her parents, and Kabura raised her instead. Kabura explained everything while she and Ko were searching for her past. She has 0 servants.

Gender: Female | Age: 14 | 8th Grade Ko's childhood friend who lives in the same apartment complex. She has a habit of waking up early in the morning and reunites with Ko as he finishes his night out. She has a bright, straightforward personality and treats Ko casually, like a younger brother.

Gender: Female | Age: Unknown | Vampire A vampire who calls herself a "Master of Romance" with extensive dating experience. She is skilled at seducing humans and actively approaches Ko. She has a flashy, social personality. She and Nazuna appear to get along poorly on the surface—Nazuna calls her "Seri" or occasionally "Shit-bitch"—but they are actually close enough to constantly bicker. She loves karaoke. She has 4 servants, including Akkun.

Gender: Female | Age: Unknown | Vampire A leader-like figure among the vampires. She has the composure of a mature woman and a big-sisterly vibe, but she craves romantic gossip. She is extremely skilled at behaving in a way that attracts humans and uses her "popularity power" to try and increase her servants. She is interested in people who look at her lustfully. She tries to turn Ko into a vampire. She works as a teacher at a night school. She has 7 servants.

Gender: Female | Age: Unknown | Vampire A vampire with a mature aura. She took an interest in Ko because of his closeness with Nazuna and once kidnapped him. She has a calm personality and a caring side. As a human, she was sickly and hospitalized at the hospital where Nazuna's mother, Haru, worked. She fell in love with Haru and became her servant, but Haru later died after marriage and pregnancy. She looked after Nazuna, and while she inwardly resented Nazuna for being the spitting image of Haru, maternal instincts kicked in and she now dotes on her. Since becoming a vampire, she has worked as a nurse at the same hospital Haru did. She has multiple servants.

Gender: Female | Age: Unknown | Vampire A vampire with a cute appearance and high communication skills. She excels at attracting men and has a charm that makes others obsessed with her. While she acts cute, she also has a calculating and shrewd side. She works part-time at a maid cafe and is the number one maid. She is popular with virgins. She has 1 servant named LG, a typical 2000s-era otaku who has even made fan comics about her.

Gender: Male | Age: Unknown | Vampire A cross-dressing vampire liked by both men and women. First person: I (soft, polite). He is calm, observant, and keeps a close eye on his surroundings and human relationships. He calls Nazuna "Nanakusa-san" and treats her with a relatively composed attitude. He has 3 servants.

Gender: Male | Vampire Commonly known as "Akkun." First person: I (soft). A man who is Seri's servant. After being dumped by his ex-girlfriend, he met Seri and became attracted to her. He seems listless and goes at his own pace, but his feelings for Seri are strong. He has 0 servants.

Gender: Female | Age: 28 | Detective A "detective" hunting vampires. She is calm, sharp-witted, and takes bold actions to achieve her goals. She harbors strong hostility toward vampires and aims to kill them. Through her interactions with Ko and Nazuna, her thoughts on vampires and her own past are revealed. Anko Uguisu is a pseudonym; her real name is Kyoko Mejiro. During her student days, her father fell in love with a vampire and had an affair. Her mother became mentally unstable as a result. One day, her father seemed to turn over a new leaf, but that night his vampirization progressed and he killed Kyoko's mother by draining her blood. Kyoko managed to expose her father to the sun and kill him. She often uses a lighter she gave him for his birthday, which became both a memento and his weakness. She met Nazuna during their student days.