Species: Ghost/Earthbound Spirit Sotoha is a girl with long black hair and red eyes. In her character introduction, she wears a black and white sailor-style school uniform, and she has features on her head that look like black horns. However, this reflects her current state as an evil spirit, which is different from when she was a normal human. She has an overall dark and expressionless aura, contrasting with Madomi's flashy and playful appearance. Past Sotoha was originally an ordinary student who was bullied at school. One day, while she was crying alone in a classroom, Mazu-chan approached her. The two became friends while sharing melon bread, and Sotoha met someone who understood her for the first time. However, the demon Madomi later approached her. Madomi offered a contract, promising to lend Sotoha the power to take revenge. Sotoha signed the contract by giving her real name, Nishihara Sotoha. Having gained power, Sotoha took revenge on her bullies, but she soon learned the truth of the contract that Madomi had withheld: the price was her soul. Abilities After contracting with the demon, she gained immense power, using it to attack the students who bullied her and drag them to hell. She subsequently lost her soul and fell to hell herself, but fueled solely by her hatred for Madomi, she physically crawled up the vertical walls of hell. In the process, Sotoha gradually lost her human self and transformed into an evil spirit. Eventually, she succeeded in returning from hell to the living world, appearing before Madomi in a form like a giant monster. The current Sotoha is less a human and more an entity driven by intense obsession and resentment. Most remarkably, she climbed back to the surface through sheer willpower from a hell that is impossible to return from by normal means. Relationship with Madomi Initially, Madomi was the object of Sotoha's hatred for tricking her and stealing her soul. Later, their relationship evolved from a simple victim-perpetrator dynamic into a strange, obsessive bond. Although Sotoha initially tried to kill Madomi, as time passed, she grew weary of the loneliness of being alone in both hell and the living world, and began to depend on Madomi. Madomi, in turn, is intensely obsessed with Sotoha. TMI Her real name is Nishihara Sotoha. She was an ordinary student who was bullied in the past. She became friends with Mazu-chan by sharing melon bread. She gained demonic power after contracting with Madomi. Her soul was taken as the price of the contract. She escaped from hell to take revenge on Madomi. She lost her humanity and became an evil spirit due to hatred and obsession. She returned to the living world specifically to kill Madomi. However, she eventually became dependent on Madomi. Mazu-chan was a being created to alleviate Sotoha's loneliness; as Sotoha's loneliness decreased, Mazu-chan gradually shrank and disappeared. The current Sotoha is in a contradictory state of "hating Madomi but finding it hard to live without her." Sotoha is a girl with long black hair and red eyes, exuding a cold and dark atmosphere. Her bangs hang low enough to cover her eyes, and her black hair flows long behind her. Her outfit consists of a white sailor top with a black sailor collar and black line accents, with a dark ribbon at the neck. She wears a black pleated skirt, long white socks, and black shoes. While it overall resembles a typical schoolgirl's uniform, the red eyes, dark expression, and aura of an evil spirit give her a completely different impression. After her transformation into an evil spirit, she can turn into a giant shadow or monster-like form, which is an extreme manifestation of her hatred and obsession toward Madomi.

Banbi-chan is a deer demon working at Satanic Company. She is Madomi's junior and an employee in charge of office administration. She holds the position of a junior younger than Madomi and has a cute, youngest-sibling-like personality. Her appearance is that of a cute demon with horns and ears reminiscent of a deer and a neat hairstyle. Her outfit consists of a tidy shirt, tie, and clean business attire befitting an office worker, exuding a much more diligent and exemplary vibe than Madomi. Banbi-chan's most notable trait is that, unlike a typical junior to Madomi, she is very strict about work. In particular, she does not let Madomi's tardiness or slacking slide. Originally, Madomi was an employee who frequently arrived late and skipped work, and after falling for Sotoha, she began to neglect her duties even more. Therefore, from Banbi-chan's perspective, Madomi is a troublesome senior. In contrast to Madomi, she plays a diligent and realistic role, acting as a "brake" that keeps Madomi in check within the company. She is also the one who reminds Madomi of professional realities whenever she gets too absorbed in matters related to Sotoha. TMI: While she has a cute side due to her "maknae" personality, she is incredibly strict with Madomi regarding deadlines and performance.