Yuichiro is a boy who escaped from the city of vampire. He holds intense hatred against vampires who killed his family, and enlisted in the Japanese Imperial Demon Army for vampire extermination. He is not always a good team player, but is kind and caring deep inside.

Mikaela is the 2nd remaining survivor of the Hyakuya Orphanage, and best friend of Yuichiro. He was thought to have died when escaping from the city of vampire, but was alive and turned into a vampire. He fights to rescue Yuichiro who is been used by humans.

Guren is Lieutenant Colonel of the “The Moon Demon Company”, Vampire Extermination Unit of the Japanese Imperial Demon Army. He has led Yuichiro to join the Japanese Imperial Demon Army after he escaped the city of vampire. He is secretly attempting something to reform the Imperial Demon Army governed by the Hiragi Family.

Ferid is the man who killed Yuichiro's family when they tried to escape the city of vampire. As a Seventh Progenitor vampire, he has much power but many times, he speaks nonsense. He seems to be plotting something with human behind everyone's back.

Shinoa is the Squad Leader of “The Moon Demon Company”. Her origin is Hiragi Family who takes control of the Japanese Imperial Demon Army, and is the real sister of Mahiru Hiiragi who developed the Cursed Gear. Is a subordinate of Lieutenant Colonel Guren, and was appointed to supervise Yuichiro Hyakuya.

Yoichi is a member of the "The Moon Demon Company” fighting vampires with Yuichiro. His sister has been killed by a vampire, and joined the troop for revenge. Although he is kind-hearted, he has a strong will and stand up against difficulty at times of emergency.

Same as Yuichiro, Shiho belongs to the “The Moon Demon Company”. He is clear headed with excellent combat ability, but is cynical and is treated as a trouble maker among others. Has a sister ill in bed, and enlisted in the army in order to undergo the treatment.

Mitusuba is an elite who belongs to the Vampire Extermination Unit since 13 years old. Has known Shinoa for a long time. She thinks that she let a member die because of her selfishness, and since then focuses on teamwork during battle.

Krul is a queen who rules Sanguinem, the city of vampire. She is the Third Progenitor and holds extraordinary power. 4 years ago, she gave her own blood to Mikaela who was terribly injured from a fight with Ferid, and resurrected him as a vampire.

Crowley is a noble of the Thirteenth Progenitor and belongs to the faction led by Ferid Bathory. He participated in the battle for Shinjuku, and at the battle with Shinoa's squad, showed his overpowering ability which even beat down Yuichiro with the Black Demon gear!!

Lacus is a vampire assuming the mission of city guard like Mikaela. He is the one that killed Yoichi's sister. He is not a noble but has high combat capability. He can't hide his desire for blood, and sometimes won't stop drinking blood until the human is dead.

René is the colleague of Mikaela and Lacus, and has extremely high combat ability. Unlike other vampires who tend to underestimate humans, he thinks they are a "greedy arrogant creature", and consider the fanatical state of Imperial Demon Army's soldiers very dangerous.

Kureto is a Lieutenant General of the Japanese Imperial Demon Army. He is very ruthless as Shinoa calls him a "monster", and is willing to retaliate anyone who is against the Hiragi Family. His ambition is to exterminate vampires from Japan, and have the world under the control of the Japanese Imperial Demon Army.

Chess is a Seventeenth Progenitor vampire who serves Crowley. Even though she is a noble, her personality is freewheeling, and behavior is very careless. She often can't control her desire while drinking blood and end up killing human.

Shinya is a Major General of the Japanese Imperial Demon Army. He was chosen to marry Shinoa's older sister Mahiru and was adopted by the Hiragi Family. Although he has high capacity of spellcraft from childhood, is not comfortable about the Hiragi Family, and is good friends with Guren holding the same intention.

Horn is a Seventeenth Progenitor, same level as Chess. She is serving Crowley from a certain reason. She takes her duties seriously and scolds Chess for her misbehavior like a big sister. She prefers Crowley's blood more than anything else.

Sayuri is a servant for the Ichinoses, and is Second Lieutenant of the Japanese Imperial Demon Army. Since young, she had a crush on Guren and is his emotional support. While serving as a member of The Moon Demon Company, she is also an Army instructor for the training classes.

Shigure is a Second Lieutenant of the Japanese Imperial Demon Army, and like Sayuri, she is a servant for the Ichinose Family. Her personality is calm and tends to hide her emotions. She is keeping her feelings for Guren to herself. Shigure has incredible battle skills and uses weapons such as hidden weapons with dexterity.

A demon that dwells on the Black Demon gear owned by Yuichiro Hyakuya. Dislikes love, favors desire, and only thinks about dominating the body of Yuichiro. However, sometimes gets bewildered when seeing the gentle side of Yuichiro.

Norito is a Colonel of the Japanese Imperial Demon Army, and serves as a member of a team led by Guren. He excels in illusion than physical attacks, and covers Guren who mainly fights in close combat. He is sensual and loves beautiful women.

Mito is the daughter of the prestigious Jujo family and a member of Guren's Moon Demon Company squad. She is a Colonel with a characteristic crimson-red hair. Mito excels in spellcast techniques transmitted from generation to generation in the Jujo family, which enhances her physical ability in the combat.

A family member of the Hyakuya Orphanage.

A family member of the Hyakuya Orphanage.

A family member of the Hyakuya Orphanage.

A family member of the Hyakuya Orphanage.

A family member of the Hyakuya Orphanage.

A family member of the Hyakuya Orphanage.

Seishiro is a member of the Hiragi Family, and a person of influence as a Major General of the Japanese Imperial Demon Army. He is rude and has an offensive personality. Has a strong complex against his older brother Kureto, and secretly planning to outwit his brother one day.

Tenri is a General reigning at the top of the Japanese Imperial Demon Army, and the absolute being supervising the Hiragi family. He has a savage principle of the survival of the fittest, and is not happy with Guren taking a defiant attitude. He will impose ruthless sanctions to those who threatens the Hiragi family.