"Denpa teki na Kanojo" is a seinen manga series written by Kentarō Katayama and illustrated by Yamato Yamamoto. The story is divided into two arcs, each focusing on a self-contained mystery with psychological and supernatural undertones. The narrative centers on Juuzawa Juu, a delinquent high school student with a troubled past, and Ochibana Ame, a mysterious girl who becomes fixated on him, claiming to have been in love with him since childhood.

The first arc, "Koufuku no Kane," begins with Ame approaching Juu and declaring herself his "knight," vowing to protect him. Shortly after, a series of brutal murders occurs at their school, with victims being strangled by piano wire. Ame insists that the killer is targeting Juu, and the two begin investigating. The mystery deepens as they uncover connections to a tragic incident from Juu's past involving his childhood friend, Kana. The arc explores themes of obsession, guilt, and the blurred line between justice and vengeance, culminating in a confrontation that reveals the killer's identity and their twisted motivations.

The second arc, "Kenka no Hana," shifts focus to a new mystery involving a string of suicides among female students. Ame and Juu investigate, uncovering a disturbing pattern tied to a cursed cell phone game. The arc delves into the psychological manipulation of the victims and the dark influence of urban legends. As the investigation progresses, Juu and Ame confront the orchestrator of the suicides, revealing a complex web of manipulation and despair. The arc further develops the dynamic between Juu and Ame, highlighting Ame's unwavering loyalty and Juu's growing reliance on her despite his initial reluctance.

Juuzawa Juu is portrayed as a loner with a sharp mind and a strong sense of justice, though his abrasive demeanor often alienates others. His past trauma and guilt over Kana's death shape his actions and relationships. Ochibana Ame, on the other hand, is enigmatic and unpredictable, with a deep, almost fanatical devotion to Juu. Her motives and background remain ambiguous, adding to her mystique. Together, they form an unconventional partnership, with Ame's unorthodox methods complementing Juu's analytical approach.

The series blends elements of mystery, psychological thriller, and supernatural horror, with a focus on character-driven storytelling. The narrative is tightly paced, with each arc building tension through its exploration of human psychology and moral ambiguity. The interplay between Juu and Ame serves as the emotional core, with their complex relationship driving much of the story's intrigue. "Denpa teki na Kanojo" stands out for its atmospheric tone, intricate plotting, and exploration of darker themes within the confines of a high school setting.