The provided chapters detail the experiences of Eldra, a member of the Demon King's Four Heavenly Kings, who is secretly a demon disguised as a powerful earth-attribute golem. Chapters 3-12 chronicle Eldra's humiliation, resignation from the Demon King's army, and subsequent journey of self-discovery, encountering both danger and unexpected kindness.
Initially, Eldra overhears her fellow Four Heavenly Kings mocking her as the weakest and most expendable member, especially after her defeat by a human hero. This revelation shatters her already fragile self-esteem, leading her to impulsively attack one of the Kings, Wheat the Gale, before fleeing the Demon King's castle. She resigns, feeling utterly dejected and betrayed.
Eldra's true identity is revealed: she is a demon who pilots a large golem, "Mobile Weapon Eldraan," and has been hiding her true, physically weak form out of shame. She believes she lacks the strength, magic, and charm expected of demons, relying solely on her golem-creation and piloting skills. After her escape, she finds solace in the wilderness, resolving to live a simple, solitary life away from the conflicts of demons and heroes.
Meanwhile, the remaining Three Heavenly Kings, Gran the Blazing and Eltrilis the Corrosive Sea, discuss the mysterious silver-haired attacker who defeated Wheat. They suspect a demon traitor and decide to report the incident to the Demon King and issue a bounty.
The narrative then shifts to Yuuri, a summoned hero who, unlike others, refuses to kill demons due to her belief that they can communicate and possess hearts. She is living under house arrest in the Aurelia Kingdom for her leniency towards demons, eventually being stripped of her hero title and exiled. During her exile, Yuuri encounters Eldra, who has collapsed after a fierce battle with a hero. Yuuri, despite Eldra being a demon, intervenes and saves her life by transferring her own immense magic, an act that leads to her being hailed as a true hero by the elves of a nearby village.
Eldra awakens in the elven village, initially terrified and confused, especially when she learns Yuuri is the hero who defeated her. She is treated with kindness by the elves, particularly by a young elf named Monica and the village doctor, Shido. However, her demon identity is revealed, causing panic and debate among the villagers about her fate. Yuuri, who has also been exiled and is now a resident of the village, vouches for Eldra, leading to a forced cohabitation arrangement.
To ensure Eldra doesn't cause trouble and to prevent her from leaving the village, Shido proposes a magical "Ring of Vows" that binds Eldra and Yuuri together, preventing them from being separated by more than a certain distance without dire consequences. Eldra, initially resistant, eventually agrees to the arrangement, seeing it as a way to avoid the village's judgment and potentially find a semblance of her desired peaceful life, albeit with the constant presence of Yuuri. The chapters conclude with Eldra and Yuuri bound by the rings, their future uncertain but intertwined.
