Obsession, originally titled 執着, is a gripping Japanese web novel that delves into themes of horror, mystery, and tragedy. The story follows a promise made to a childhood friend, You-kun, leading to an unbreakable bond that transcends time and space. The narrative unfolds with chilling twists and turns, involving elements of psychopaths, serial killers, and suicides. With an intense focus on the yandere trope, Obsession offers a unique and haunting reading experience for fans of dark psychological fiction.