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Kokoro’s devotion to her classmate Eikyū is anything but ordinary—it is a lethal, consuming obsession. Driven by a desperate need to be the only woman in his life, Kokoro embarks on a chilling path of manipulation and murder, starting with the elimination of a romantic rival and progressing to a former friend who knows too much. Even as the consequences of her crimes catch up to her, Kokoro's psychological grip on Eikyū refuses to loosen. This dark psychological romance explores the terrifying boundaries of love and possession, leading to a haunting conclusion where the line between victim and partner blurs. Can Eikyū ever truly escape the shadow of a killer who claims to love him most? Comparable works include Future Diary