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There are rumors circulating about a CD, named "Trigger," that is said to elevate the intelligence of whoever listens to it. Nevertheless, there are also reports of unexplained vanishings and deaths associated with the CD. Hayato, a friend of Chitose, and his family are among those who have gone missing after listening to it. Although there is evidence showing that Hayato is gone for good, Chitose still doubts and resolves to reveal the truth about the ominous CD.