Born to a cult that studied demons, Ardyn's unique nature as a human-demon hybrid made him a subject of experiments for most of his life. When his village was wiped out by a vicious demon attack he fled, thinking everyone in his past was gone, and basked in his newfound freedom by becoming a devil hunter. Putting his new skills to use, he is drawn to Apom Capital City by prophetic nightmares, and once he arrives he meets the confused demon Fionula Ione. Once the city falls into chaos he begins to uncover the origins of his demonic power - and why his village was wiped out.

Boisterous, lovable and not terribly bright, Fionula awoke in the Frost Hells among bodies of fallen demons. Entering a gateway with no idea where she was, she ended up in Apom Capital City, where she fled from humans for a time. Eventually she was found by Ardyn Doyle who befriended her, and the two began looking into the demonic activity in the city. When Ardyn's old teacher makes an appearance and disaster strikes the city, Fionula begins piecing together her past - and herself.

A battle-loving demonic spirit trapped in an ancient suit of Angelo armor, who had long since forgotten his origins. Having been salvaged after an untold age of dormancy by a demon-hunting organization, the Knights of Ulysia, he is awakened and given purpose within their ranks. Serving under them he aims to regain his original body and remember his past - a mission that leads him to investigate the demon activity in Apom Capital City.

A rambunctious young witch who inherited chaos magic from his parents. When the Knights of Ulysia found him, they meant to retrieve a demonic ring on his hand. When it wouldn’t part with him, they were forced to take Immanuel as well, and train him as a knight. Though his intentions are pure, Immanuel becomes easily lost in the fun of chaotic magic, and while surviving through the living hell that Apom Capital City becomes he rapidly awakens yet more of his demonic power and arcane abilities. He travels with Geno Angelo, his assigned chaperone, as they try to undo the damage to the city.

A human-succubus hybrid born and abandoned in Spain, who used her demonic charms to survive. After being hunted down by demon hunters determined to kill her, she is on the run with one of her assailants who could not bring himself to finish the job. Aftering fleeing to Apom Capital City where she lives with Niccolo, she works as a stripper and escort at Angels Lite while trying to keep a low profile - until unfortunate car trouble puts her at the center of the disaster that strikes the town.

Formerly a member of the devil-worshiping Order of the Sword. Niccolo was part of a group sent to hunt Mariley, but when he saw her could not bring himself to take her life. He helped her escape, and the two fled from Spain to Apom Capital City, where both tried to law low. Niccolo works as a pizza boy for a verbally abusive boss, doing his best to protect Mariley and his beloved car. When the blizzard overtakes the city, the destruction of Niccolo's car is the least of his concerns: his old ties with the Order of the Sword come back to haunt him.