The story begins with the introduction of Liliana Lyche Lyden, a succubus renowned as a "witch of national ruin" and the epitome of her kind. Possessing unparalleled allure, she could captivate anyone, regardless of gender. Despite her immense charm, Liliana finds herself imprisoned in a cell, having been apprehended after seducing a foolish noble who was secretly plotting rebellion against the king. Liliana, initially dismissive of her confinement and the guards, attempts to use her succubus abilities on a young guard named Asbel Kahn.
Asbel, however, proves to be entirely unaffected by Liliana's seductive advances. He calmly dismisses her attempts, even commenting on her scent. Liliana, shocked and insulted, reveals her identity as the "witch of national ruin," but Asbel remains unfazed. He introduces himself as the captain of the third division of the Valen Kingdom's knight order, tasked with her surveillance and guard duty. To Liliana's astonishment, Asbel reveals he is "impotent," rendering her usual methods useless.
The narrative then shifts to Asbel's assignment by his superior, Commander Gran. Gran explains that Liliana is not an ordinary succubus but a "Succubus Queen," a rare and powerful being. Due to a treaty with the demon realm, she cannot be executed, but her allure makes her a dangerous prisoner to guard. Asbel, known for his stoic demeanor and combat prowess, is chosen for this delicate task. Gran also hints at Liliana's exceptional beauty and the need to protect her from potential harm that could escalate tensions with the demon realm. Asbel, despite his reluctance for such duties, accepts the order, with Gran assuring him the mission would be short-lived, likely within a month, before Liliana is handed over to the demon realm.
Liliana, upon learning this, refuses to return to her homeland, finding the human kingdom more appealing due to its food and abundant "nutrients" (people to seduce). Asbel, unmoved by her protests, reiterates that her seductions are ineffective against him. Liliana, frustrated but undeterred, vows to find a way to escape, believing she can still seduce Asbel. She prepares herself, using a glamour spell to conceal her succubus features, and resolves to use her charm to manipulate Asbel into opening the cell.
Asbel continues his surveillance, bringing Liliana meals and reading. Liliana attempts various seductive tactics, including feigning an itch on her back to get Asbel to apply medicine, which he does with detached efficiency. She notices his lack of reaction and begins to suspect he might be emotionless. During this interaction, Asbel makes a comment about her weight, specifically her chest size, which further infuriates Liliana, who prides herself on her perfect physique. She realizes her usual methods are failing and begins to consider alternative strategies, focusing on breaking through his emotional defenses.
Meanwhile, Asbel reports to Commander Gran, who expresses confidence in Asbel's ability to resist Liliana's charms. Gran reveals that the planned handover of Liliana to the demon realm is scheduled for the next morning. He also hints at potential unrest and the possibility of assassins being sent by the demon realm to retrieve her, emphasizing Asbel's importance in maintaining order. Asbel, ever pragmatic, acknowledges the potential danger. He also inquires about the nature of Succubus Queens, specifically a rumor about them being "connected," a detail Gran dismisses as unlikely to be revealed.
Liliana's friend, a pixie named Mimii, visits her through a ventilation window, offering to break her out. However, Mimii's magic fails to open the cell, suggesting advanced security measures in the human kingdom. Liliana, though disappointed, maintains her resolve to escape and reveals her intention to manipulate Asbel. She also receives a simple necklace from Mimii as a token of friendship.
Later, Asbel approaches Liliana with a request: he needs her help to heal a sick cat belonging to a weapon shop owner who had previously helped him. He explains that the kingdom lacks veterinary care and that he cannot leave his post to assist. Liliana, initially hesitant and annoyed by Asbel's stoic demeanor, agrees, seeing it as an opportunity to gain leverage. She successfully heals the cat, earning the gratitude of both Asbel and the shop owner, who gives Liliana a simple, enchanted bracelet. Asbel, though outwardly stoic, shows a subtle shift in his demeanor, expressing thanks for her help.
The narrative then reveals that the demon realm and the human kingdom have concluded negotiations, and Liliana is to be returned to her homeland within two weeks. However, her status might change, potentially making her a guest rather than a prisoner. Asbel informs Liliana of this development, which she initially misinterprets as freedom. He clarifies that her surveillance will continue, but her actions could now impact diplomatic relations. Liliana, frustrated by Asbel's unwavering demeanor, contemplates using a powerful artifact, a ring, to force his compliance, but hesitates.
The chapters conclude with the shocking news delivered by Mimii: Liliana's execution has been decided. Asbel, upon hearing this from Gran, is visibly disturbed, questioning the rationale behind this decision, especially given the existing treaty. Gran reveals that an unexpected move by the demon realm has angered certain nobles, who are now seeking to create conflict. Despite Asbel's loyalty and his willingness to follow orders, Gran expresses concern about Asbel's potential actions if he deems the execution unjust. Asbel, however, remains resolute in his commitment to his principles.
