The good stuff
A very odd Aoyama feature. Part sci-fi, part music film, part drama. It's a full-on arthouse project though, so expect a very deliberate and slow film that isn't too interested in presenting a clear-cut narrative or enjoyable characters. Instead, we're getting harsh noize concerts and tragic cyphers who hardly open up during the course of the film. This won't be everybody's cup of tea, it's by far my favorite Aoyama film, with great performances by Asano and Miyazaki, a superb score and neat cinematography.
Worthy but flawed
Director Shinji Aoyama isn't really known for making documentaries, To the Backstreet gives us a little insight as to why that may be. Though he tried his hand at a few around the turn of the century, he just as soon abandoned the format. My guess is that they were deemed a bit too hermetic to do its subjects justice, at least that's my take after watching this film.
Not knowing anything about Kenji Nakagami (a famous writer) is a real hindrance, as Aoyama isn't interested in the least to give any kind of context. The film starts with a 10-minute car ride through a mountainous region in Japan, mostly spent in silence with the driver. It takes a while before you realize Aoyama is stitching together footage from Nakagami's personal archive with his own, discovering the region where he grew up.
In between there are segments of Nakagami's literature being read aloud. And that's about it really. Fans of Nakagami may get something out of it, at the very least it's a decent look at the Japanese countryside, but I was glad this documentary was just 60 minutes long. Only for true Nakagami insiders, others may be better served reading the man's Wikipedia page.