This article may be expanded with text translated from the corresponding article in the Japanese Wikipedia. (March 2013)
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Koichi Kashiwagi, a college student, goes to his cousins' for his father's funeral. After the ceremony, as he is on summer vacation, he stays with them. He experiences recurring nightmares and must hold down a strong homicidal impulse surfacing from deep within himself. One day Koichi dreams that he slaughters a person violently. The next day, the news reports the event of a violent homicide in the park where Koichi committed the murder in his dream...