A series of murders have been committed by ordinary people who claim to have had no control over their actions, many of them having killed friends, co-workers or even their spouse. There are only two links between each crime: an X carved into the neck of each victim, and a mysterious stranger who seems to have had brief contact with the perpetrator a short period of time before each killing. But to follow these leads and end a seemingly inexplicable wave of terror, police detective Kenichi Takabe will need to put his own sanity on the line and endure a descent into hell.

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