"Welcome to Hell Customer Service. I am Pandemonica. How may I help you?" Title: The Tired Demon Traits: A demon appearing in Chapter 1, she is the first conquest target. She uses polite speech. As the representative of Hell Service Center, she is relatively kind and polite among the demons. [When drinking coffee] "Ah! The 'Tired Demon' is no more." Title: The Sadistic Demon Traits: Her true title is 'The Sadistic Demon'. Usually, she is too exhausted for her true nature to emerge, but once she recovers her energy by drinking coffee, her sadistic side comes out. At this time, her small horns grow into large spirals. Perhaps due to her setting as a guide, she uses polite speech when tired and switches to informal speech once her fatigue vanishes.

"You and me. Right here. Right now." Title: The Lustful Demon Traits: A demon appearing in Chapter 2, based on the demon of lust, Asmodeus. With her flushed cheeks and distinct heart-shaped pupils that set her apart from other demons, she appears to be in a constant state of arousal or excitement. Contrary to her title as the demon of lust, her clothing is surprisingly modest, though the curves of her body are very voluptuous.

"A human? A real human? Take us with you." Title: The Triple Demon Traits: A demon appearing in Chapter 3. Cerberus is unique in that triplets move as one, and it is established that three bodies share a single soul. Thus, they do not have separate personalities, but they use 'we' as their first-person pronoun. They possess many dog-like traits.

"Great, more brainless idiots... Never seen an ugly mug like yours before. What are you doing in Hell?" Title: The Sour Demon Traits: A demon appearing in Chapter 4. True to her name, she always wears a sour expression and has a very prickly personality. Judging by her mentions of rhythm roguelikes or turn-based strategy games, she is a total gaming geek. She also loves alcohol and talks a lot about vodka. Her favorite brand of vodka is 'Rokita'. Given her exhaustion with the life of having to keep Hell clean and livable, she likely worked as a janitor in Hell.

"Hey. Heard you're building a harem. I'm in." Title: The Bitch Demon Traits: A demon appearing in Chapter 5, she is Malina's older sister. She calls Malina by the nickname 'Malinka'. While Malina is prickly, Zdrada has a vulgar, delinquent-like personality. Her attire is also very rebellious; unlike most demons who wear neat suits, she wears bondage-style accessories and piercings on her arms. Furthermore, despite being a demon, she wears a cross around her neck. Because of this delinquent appearance, it's often overlooked, but she is just as beautiful as the other demons. If her sister is a heavy drinker, she is a heavy smoker. Unlike her sister, she hates games.

"Oh my God! What is a living human doing in Hell? This is quite unusual." Title: The Curious Angel Traits: The only angel, appearing in Chapter 6. As an angel, she is characterized by pure white clothing, black hair, and blue eyes, contrasting with the demons. She also wears a cross around her neck. Judging by how she constantly babbles about theses and A+ grades, she is presumed to be a graduate student. Her reason for infiltrating Hell is to collect research data on sin and demons. Because of this, whenever interesting information related to demon research comes up, she pulls out a notebook to take notes. Her personality is innocent and naive, fitting for an angel.

"Yo, you solved that puzzle? Awesome!" Title: The Awesome Demon Traits: A cheerful demon appearing in Chapter 7. She wears a short-sleeved dress shirt with a tie, suit pants, open-finger gloves, and a jacket draped over her shoulders like a cape. She is not only cheerful but also quite generous. It turns out she wears sunglasses because she is blind.

"We finally meet. You have proven your worth by passing the trials. Offer me your soul, and I shall make you my cherished slave." Title: CEO of Hell Traits: Appearing in Chapter 8, she is the Queen of Hell and the title heroine of this work. She is effectively the main heroine. She wears a crown of thorns on her head. Befitting her title as the Queen of Hell, the fanbase calls her Boss, Queen, or Big Sister CEO. Her nickname in the story is Lucy. She loves pancakes.

"Ignite the Sin Machine! The trials cannot be avoided!" Title: The High Prosecutor Traits: The final boss of this work. Her appearance is very distinct from the other demons; unlike the others in suits, she wears a very funky and sexy style of clothing. Her overall image is reminiscent of a rock star or a biker. Also, unlike the other white-skinned demons, she has dark skin and glowing white eyes. The Roman numeral XX (20) is written on her armband and the back of her jacket; in Tarot, the 20th card is 'Judgement'. The 'trials' are essentially a chain-dodging game.