"I'm Not a Succubus!" centers on the life of a young woman named Lilith, who is mistakenly identified as a succubus due to her striking resemblance to one. Despite her human nature, Lilith is thrust into a world of supernatural intrigue and chaos as demons, angels, and other mythical beings begin to take an interest in her. The story unfolds in a modern urban setting where the boundaries between the human and supernatural realms are increasingly blurred.

Lilith’s life takes a dramatic turn when she encounters a demon hunter named Kaito, who initially seeks to eliminate her under the assumption that she is a succubus. After realizing her true nature, Kaito becomes her reluctant protector, guiding her through the dangers of the supernatural world. Their relationship evolves from one of mistrust to a partnership as they navigate a series of escalating conflicts involving rogue demons, scheming angels, and ancient prophecies.

The narrative explores themes of identity, prejudice, and the struggle to belong. Lilith’s journey is marked by her efforts to prove her humanity while grappling with the expectations and assumptions of those around her. Supporting characters include a variety of supernatural entities, such as a mischievous demon named Asmodeus, who harbors a hidden agenda, and a stoic angel named Seraphina, who serves as both an ally and a foil to Lilith.

The plot is driven by a mix of action, humor, and emotional depth, with each arc revealing more about the intricate relationships between humans and the supernatural. As Lilith and Kaito uncover the truth behind her mysterious connection to the succubus race, they are drawn into a larger conflict that threatens to upend the balance between worlds. The series balances episodic adventures with an overarching storyline, creating a dynamic and engaging narrative.