一个住在森林中的残忍的杀手听到脑海中声音，被吸引到湍急河流的岸边。他被无形的力量冲到猪场附近的一个小磨坊。在那里，他看见他的另一个自我（一个女人）在磨坊干活。她跟他一样也拥有杀戮欲。两人联手将对没有戒备的村民展开一场血腥的大屠杀……A man known as the "Murderer" wanders through the woods. The sound of water flowing deep underground fills his head. Within the sound of the subterranean water flowing through the "id", the realm of the subconscious mind, the "Voice of Someone" becomes audible. The man emerging from the woods was captivated by that voice, engulfed in a raging storm and carried along by the swollen waters of a river until picked up and taken to a small steel factory in a town near the river. In front of that factory, which adjoins a pig farm, an ancient water course has been sealed with a giant spigot. The man is resonant with the "id" water sounds of that sealed water course. Before long, incidents gradually begin to occur that affect the frugal occupants of the factory, until one morning they discover the body of the head of the factory, who has been beaten to death. The perpetrator is a female employee of the factory, and in fact it was her voice that had beckoned that man there. The hatred and sadness that those two had resonated in the realm of the "id" brings about the appearance of the "Humanhog" monster, which emits a rotten stench. Around that time, as if summoned by destiny, the ex-Detective that has been pursuing that man finally arrives in that factory town.
