"Angel Blade Punish!" is a dark fantasy anime series that blends elements of action, supernatural themes, and psychological drama. The narrative centers on a world where humanity is under constant threat from demonic entities known as the "Darkness." To combat this existential threat, a secret organization called the Angel Blade Project creates genetically engineered warriors, referred to as "Angels," who wield powerful weapons called Angel Blades. These warriors are tasked with protecting humanity by eliminating the Darkness and its monstrous manifestations.

The protagonist, Neon, is a young woman who becomes entangled in the Angel Blade Project after a traumatic encounter with the Darkness. Neon is chosen to wield the Angel Blade, a weapon that grants immense power but comes at a significant cost: the wielder's life force is gradually drained with each use. As Neon struggles to master her abilities, she forms alliances with other Angels, including the stoic and battle-hardened Aoi and the enigmatic, morally ambiguous Kaguya. Together, they face increasingly dangerous foes, uncovering the true nature of the Darkness and the sinister motives behind the Angel Blade Project.

The plot delves into themes of sacrifice, identity, and the blurred line between humanity and monstrosity. Neon's journey is marked by internal conflict as she grapples with the ethical implications of her role and the toll it takes on her humanity. The series also explores the backstories of the supporting characters, revealing their personal struggles and the events that led them to become Angels. As the story progresses, Neon and her allies uncover a conspiracy within the Angel Blade Project, forcing them to question their purpose and the morality of their actions.

The narrative is driven by intense action sequences, psychological tension, and a gradually unfolding mystery surrounding the origins of the Darkness and the true intentions of the Angel Blade Project. The series maintains a somber tone, emphasizing the high stakes and emotional weight of the characters' decisions. By the conclusion, Neon and her companions are left to confront the consequences of their choices, setting the stage for a climactic resolution that challenges their understanding of good and evil.