In the streets of Tokyo, a wave of bizarre murders begins to unfold. Each crime scene is marked by a gruesome "X" carved into the victims' necks, and the perpetrators are everyday individuals who have no recollection of committing the acts. Detective Kenichi Takabe, whose stoic demeanor masks the stress of the case, struggles to find a rational connection between the random murderers. The enigma deepens as each suspect reveals having met a mysterious man who seemingly influenced their violent actions through a hypnotic suggestion.

Takabe's investigation leads him to this enigmatic figure, Mamiya, a drifter with amnesia and an eerie calm. Despite being detained, Mamiya's unnerving detachment and cryptic dialogues frustrate Takabe and his colleague, psychologist Sakuma, who try to understand his methods. As Mamiya's manipulative influence begins to take its toll on Takabe's psyche, the detective finds himself in a desperate race against time to break the chain of violence. His journey into the abyss of human consciousness exposes him to unsettling truths about mind control and the darker facets of human nature.