"Akuma-kun Boku wa Tenshi ni Naritai" centers on the protagonist, Akuma-kun, a young boy born into a family of demons. Despite his demonic heritage, Akuma-kun harbors a deep desire to become an angel, driven by his kind-hearted nature and aversion to the destructive tendencies of his lineage. This internal conflict forms the core of the narrative, as Akuma-kun navigates the challenges of reconciling his demonic powers with his aspiration to embody purity and goodness.

The story unfolds in a world where demons and angels coexist, often in opposition. Akuma-kun's journey is marked by his interactions with both celestial and infernal beings, each encounter testing his resolve and moral compass. His demonic abilities, which include formidable strength and dark magic, frequently clash with his angelic aspirations, creating a dynamic tension that propels the plot forward.

Key characters include Akuma-kun's family, who represent the traditional demonic values he struggles against. His father, a powerful demon lord, expects Akuma-kun to embrace his heritage and fulfill his role in the demon hierarchy. Conversely, his mother, though also a demon, exhibits a more nurturing side, subtly encouraging his desire for change. Supporting characters include a group of angels who initially distrust Akuma-kun due to his demonic nature but gradually come to recognize his genuine intentions. Among them is a particularly influential angel who becomes a mentor figure, guiding Akuma-kun in his quest to transcend his origins.

The plot is structured around Akuma-kun's efforts to prove his worthiness to become an angel, often involving missions that require him to confront both external threats and internal doubts. These missions frequently pit him against other demons, including rivals from his own family, who view his aspirations as a betrayal. Simultaneously, he must navigate the skepticism of the angelic realm, which is wary of a demon seeking redemption.

Themes of identity, redemption, and the struggle between good and evil are central to the narrative. Akuma-kun's journey is one of self-discovery, as he grapples with the duality of his nature and seeks to forge a path that aligns with his ideals. The series balances moments of action and conflict with introspective scenes that delve into Akuma-kun's internal struggles, creating a layered and engaging story.

As the series progresses, Akuma-kun's actions begin to influence both the demon and angelic realms, challenging long-held prejudices and sparking change. His unwavering determination and acts of compassion gradually earn him the respect of both sides, though not without significant trials and setbacks. The narrative builds toward a climactic resolution that addresses the central conflict of Akuma-kun's identity and his place in the world, offering a satisfying conclusion to his journey.