Takakura (Hidetoshi Nishijima), a former detective of the Metropolitan Police Department's First Investigation Division, switched careers after an accident and became a professor of criminal psychology at a university. Not long ago, he and his wife Yasuko (Yuko Takeuchi) moved to a new home. However, the neighbors around the new home seemed too indifferent, especially the man named Nishino (Teruyuki Kagawa), who always felt a thousand miles away. Of course, it wasn't long before Nishino showed his friendly side to the Takakura couple, which made Yasuko, who rarely communicated with others, quite relieved. At the same time, Takakura and his old colleague Nogami (Masada Higashide) from the First Investigation Division investigated a missing three person case. As they continued to go deeper, they discovered shocking facts. The darkness continued to devour those who tried to approach it. Takakura looked back and was surprised to realize that since he moved to the new home, he had unknowingly fallen into the death trap carefully laid by the greedy ant lion... This film is adapted from the original work of the same name by Maekawa Yu.