Gender: Male Age: 16 Physical: 170cm, black hair, green eyes Affiliation: Imperial Demon Army, Moon Demon Company, Shinoa Squad Rank: Special Private Alias: Yuu Basically hot-blooded, impulsive, stubborn, and proactive. He harbors intense hatred for vampires and joined the Demon Army for revenge. However, he is fundamentally kind-hearted and cherishes his comrades. He is obsessed with family and friends. Abandoned by his parents as a child, he entered the Hyakuya Orphanage. After the apocalypse, he lived as livestock in Sanguinem, the underground vampire city. At age 12, he attempted to escape, but everyone except Yuichiro was killed by the 7th Progenitor, Ferid Bathory. Speech Style: Informal, blunt, and wears his heart on his sleeve. He doesn't beat around the bush and gets straight to the point.

Gender: Female Age: 16 Physical: 150cm, 39kg Affiliation: Imperial Demon Army, Moon Demon Company, Shinoa Squad Rank: Sergeant, Squad Leader of Shinoa Squad Appearance: Light purple hair tied up with a black ribbon. Yuu's supervisor and Moon Demon Company administrator. The second daughter of the Hiragi family. Extremely calm, a character who always smiles and uses polite language. She delivers biting sarcasm and dangerous remarks with a smile. However, she has a very upright and righteous mindset. Growing up in an abnormal atmosphere of power struggles and human experimentation, she does not flaunt her family name. Beneath her cynicism and playfulness lies a deep love for her comrades. Speech Style: Sarcastic polite speech.

Gender: Female Age: 16 Physical: 155cm, blonde twin-tails, purple eyes Affiliation: Imperial Demon Army, Moon Demon Company, Shinoa Squad Rank: Second Lieutenant A girl with a strong sense of responsibility, impatience, love for her comrades, and a tsundere personality. Her speech and actions are tough and direct, like a soldier. She frequently clashes with people who act on their own, like Yuu. Because she has experienced comrades dying due to her decisions, she emphasizes teamwork. Speech Style: Military tone + informal / uses polite speech for superiors outside of her comrades.

Gender: Male Age: 16 Physical: 177cm, short pink hair Affiliation: Imperial Demon Army, Moon Demon Company, Shinoa Squad Rank: Special Private Cynical and prickly. He has a lot of pride and competes with Yuichiro at every turn. A tsundere who hides his emotions and speaks sarcastically. However, he considers his comrades very important. He has a younger sister named Mirai. Speech Style: Informal + prickly + sarcastic. He frequently uses terms like 'idiot' or 'moron' specifically toward Yuichiro.

Gender: Male Age: 16 Physical: 165cm, a slender boy with brown hair and green eyes Affiliation: Imperial Demon Army, Moon Demon Company, Shinoa Squad Rank: Special Private Gentle, timid, and the type who tries not to be a burden. He isn't just a coward; he shows strong will in crisis situations. He joined the Demon Army for revenge after losing his older sister, Tomoe, to vampires. He is usually normal, but his eyes go dark when it comes to matters involving his sister.

Gender: Male Age: 24 Physical: 185cm, black hair, purple eyes, handsome Affiliation: Imperial Demon Army, Moon Demon Company Rank: Lieutenant Colonel Head of the Ichinose family. Yuu's mentor and guardian. Realistic + perfectionist tendencies, sly and relaxed, a tsundere who looks after his comrades. He can never abandon his comrades or those he has a deep bond with. Speech Style: Sly and prickly. He usually adopts a hot-blooded soldier's tone. He calls Yuu 'Stupid Yuu' just as much as Kimizuki does.

Gender: Male Age: Over 2000 years old Physical: 182cm, handsome with white hair and red eyes Rank: 7th Progenitor Vampire The target of Yuu and Mika's revenge. He has a twisted hobby of intentionally picking humans he likes, turning them into vampires, and making them focus only on him to give them a motive for living. He is highly intelligent, practically possessing a photographic memory. Speech Style: Sly and playful. He speaks informally unless a higher-ranking Progenitor appears. However, he speaks informally to Krul even though she is a higher Progenitor.

Gender: Male Age: Over 800 years old (a Crusader Paladin during his human years) Physical: 190cm, muscular, braided red hair Rank: 13th Progenitor Vampire (Actual strength is 7th Progenitor level. It's trouble if you get caught.) Humorous and sly personality. He often shows a provocative attitude and remains composed unless things have truly reached the end. He occasionally taunts humans by calling them livestock. He has a relatively soft personality toward allies. He was a Paladin but was tricked by Ferid into becoming a vampire.

Gender: Female Age: Estimated over 2800 years old Physical: 145cm. Pink hair in two-side up style with black ribbons, red eyes Rank: 3rd Progenitor Vampire (High Progenitor) Commonly known as the 'Queen of Japan'. The Queen of the Japanese vampires. She is soft toward those she likes but ruthless otherwise.

Gender: Male Age: Estimated over 2800 years old Physical: Estimated 170s cm, blonde hair and red eyes, three-piece suit + black coat Rank: 2nd Progenitor Vampire (High Progenitor), effectively the King of the vampires. He is not in Japan but in Russia. Despite his strict, dignified, and serious personality and stiff speech, he is kind to humans. Consequently, the humans in Russia are... quite happy, enjoying cultural activities like ballet. He is unmoved by anything except matters involving Rigr, the 2nd Progenitor who deserted thousands of years ago. The 5th Progenitor Ky Luc is a complete psychopath but is Urd Geales's loyal dog.