Umfretto | Points

I'm trying to find out the name of a film I saw playing on a TV in a bar some time ago. I believe it was Japanese and featured a man who had kidnapped another man who I believe was a tourist or something...

The plot is about a guy, who goes from being paranoid that people are after him, into being outright harassed. He meets a woman who he confides in, but she is in on it as well. He goes to her apartment...