The story is told through the diary of Natalya, a young girl who starts off living a seemingly privileged life but soon reveals a dark and disturbing reality. Isolated and emotionally neglected by her parents, she undergoes mysterious medical treatments and blood extractions under the control of an abusive doctor. Natalye is kept away from sunlight, heals unnaturally fast, and is involved in secret family rituals worshipping an unknown deity.
As her mental state deteriorates, Natalya forms an imaginary friend, Sarah, who shifts from comfort to manipulation. People around her disappear, and her sense of reality blurs with hallucinations and trauma. Despite brief moments of affection from new characters, Natalya is repeatedly exploited and drained physically and emotionally.
Throughout the diary, she struggles with identity, feeling more like an object than a person, and faces increasing isolation, pain, and psychological torment. Her attempts to escape fail, leaving her trapped in a cycle of abuse, with only fleeting hopes in dreams and imaginary worlds. The final entries depict a broken child unable to tell what's real, clinging to fragile hope yet repeatedly crushed by her circumstances.