Kusenosu (2007)

Ishibashi Naoto is a successful reporter who has just gotten married to his girlfriend, Saki, whom he met one month earlier. However, as Naoto begins to live a new life as a married man, strange things start to happen. Saki disappears without a trace and as Naoto begins searching for her, he finds out Saki's identity doesn't exist. When Naoto starts to dig deeper into the mystery, he begins to receive anonymous threats. Frustrated, Naoto meets a Yoshino Mariko, detective who thinks she might hold the answers to Naoto's questions.