REC 55%: Nightmare detective [Akumu Tantei - 2006]

Director: Shinya Tsukamoto [Welcome to the Quiet Room, A Snake of June, Ichi the Killer, Blind Beast vs. Dwarf, Tetsuo, the Iron Man]

Japanese detective Keiko Kirishima discovers that two suicide cases were in fact murders after the evidence reveals that both victims were attacked in their dreams. This supernatural thriller follows Keiko as she tries to enlist the help of the NIGHTMARE DETECTIVE, her only hope against a paranormal serial killer.

[rottentomatoes.com]