湿谷秘探

　　A team of influencer bloggers decides to hold a ritual at the mansion of the "black countess". A fan of the supernatural, she disappeared without a trace after she was offered to play a game that was supposed to take her to another dimension. By evoking the spirit of the Countess, bloggers let otherworldly forces into the world. The one who can bring the demons back will survive.

　　Widowed farmer Malcolm Gardner lives a quiet life near a secluded forest. When a mysterious ten-year-old girl emerges from the trees, he uncovers a hidden world lurking just beyond his view.

在本作品中，人们听了从某个卡式录音带中流淌出的“某个旋律”后，自己也渐渐哼唱起了那个旋律，被卷入了不可思议的事件中。