"Neo Angelique Abyss" is a fantasy anime series set in a world plagued by the mysterious and destructive force known as Thanatos. The story centers on Angelique, a young woman living in the peaceful town of Arcadia, who possesses a rare ability called the Arcadia Power. This power allows her to purify the land and combat the Thanatos, which corrupts the environment and threatens humanity. Angelique is discovered by a group of warriors known as the Purifiers, who are dedicated to eradicating Thanatos and protecting the world.

The Purifiers consist of Nyx, Rayne, Hyuga, and Bernard, each with unique abilities and personalities. Nyx is a calm and composed leader, Rayne is a cheerful and energetic fighter, Hyuga is a reserved and mysterious swordsman, and Bernard is a loyal and protective guardian. Together, they recruit Angelique to join their cause, believing her Arcadia Power is essential to defeating Thanatos. As Angelique trains and grows stronger, she forms close bonds with the Purifiers, each relationship adding depth to the narrative.

The plot unfolds as Angelique and the Purifiers travel across the land, encountering various challenges and adversaries. They face not only the physical threats posed by Thanatos but also internal conflicts and moral dilemmas. The series explores themes of sacrifice, duty, and the weight of responsibility as Angelique grapples with her role as the savior of the world. Her journey is marked by moments of self-discovery and emotional growth, as she learns to harness her power and confront the darkness within herself and the world around her.

Throughout the series, the characters' backstories are gradually revealed, providing insight into their motivations and struggles. The narrative balances action-packed battles with quieter, character-driven moments, creating a well-rounded story. The overarching goal remains the eradication of Thanatos, but the journey is filled with twists, alliances, and revelations that keep the plot engaging. The series concludes with a climactic confrontation, resolving key conflicts while leaving room for reflection on the characters' growth and the impact of their actions.