Nightmare Detective 2

Nightmare Detective, Akumu Tantei 2? is a 2008 Japanese horror film and sequel, directed by Shinya Tsukamoto, to the 2007 film Nightmare Detective, starring Ryuhei Matsuda as Kyoichi Kaganuma.

She tells him she suffers from nightly nightmares that are getting scarier. The murderous ghost in the dreams has already killed two of her friends and shes afraid shes the next to die. She believes that only Kagenuma could save her. Kagenuma ignores her pleas for help. Yukie, refusing to give up, returns every day to change his mind.Kagenuma finally decides to take on Yukies case to understand the circumstances of his mothers death. It, however, demands from Kagenuma more than he expected to give while it leads him into the darkest corners of dreamscape. ........

Source: Wikipedia