"The Curse of Yamamura Sadako" is a horror manga that expands on the lore of Sadako Yamamura, a central figure in the "Ring" franchise. The narrative delves into Sadako's origins, exploring her tragic past and the supernatural forces that shape her existence. The story begins with a focus on Shigemori, a young journalist investigating a series of mysterious deaths linked to a cursed videotape. As Shigemori digs deeper, the narrative shifts to Sadako's childhood, revealing her life as the daughter of a renowned psychic, Shizuko Yamamura, and her struggles with her own psychic abilities.

Sadako's early years are marked by isolation and persecution due to her powers, which are misunderstood and feared by those around her. Her mother’s tragic death and the betrayal by those closest to her further compound her suffering. The manga intricately portrays Sadako’s descent into darkness, culminating in her transformation into a vengeful spirit. The curse she embodies is tied to a videotape that carries her wrath, and anyone who watches it faces a grim fate unless they can break the curse by following specific, cryptic instructions.

The narrative alternates between Shigemori’s investigation and flashbacks to Sadako’s life, creating a dual timeline that enriches the understanding of her character and the curse’s origins. Key characters include Shizuko, whose psychic abilities and tragic end deeply influence Sadako; Dr. Ikuma, a scientist who becomes entangled in Sadako’s life; and Ryuji, a figure from the broader "Ring" universe whose connection to the curse adds depth to the story. The manga maintains a tense, foreboding atmosphere, blending psychological horror with supernatural elements to explore themes of vengeance, fear, and the consequences of unchecked power.