Ajiro Shinpei dreams of his childhood friend Ushio. In his dream, she asks him to protect her sister Mio. Startled awake, Shinpei falls face first into a large-chested woman on the ferry to Hitogashima with him, who slaps him for his trouble. At home, Mio greets him, but a small bicycle accident give Shinpei a glimpse of her underwear. None of this seems important, but it will be. It will become the first of the signs that something here is not right at all.
We learn about Ushio’s death, and the mysteries surrounding it, when Shinpei’s old friend Sou tries to explain that Ushio may have been murdered. The next morning the family of the girl Ushio saved has disappeared. Strange marks are showing up on the ground in town. And people around him seem not right somehow. Shinpei follows Mio into the hills below the local shrine where he comes across a women he’s seen before -the…