There are a lot of similarities here with Gibson's [*Pattern Recognition*][1] where Cayce Pollard is tasked with tracking down a video assembled from clips.

She does end up in Tokyo, but the creators are in Moscow.  Or really the creator, Nora, who suffered brain damage and communicates by creating the clips.  Her twin sister Stella is the one that Cayce meets and talks to.


  [1]: https://www.isfdb.org/cgi-bin/title.cgi?23596