This movie could be in a similar vain as some Japanese classic movies (Tokyo Story for example, pace-wise, not story-wise of course). It really is slow moving and takes time to introduce you to the two main characters.
Even the secondary characters get screen time and you get to know them. Apart from the really nice story/character arcs you get treated to some history/crime lessons. Some events that real happened in Japan are mentioned. But they don't feel out of context, although they don't always really fit into the story, they always keep the movie flowing nicely. For (some) western audiences a few behavior mannerisms might seem odd, but I personally did like the characters, with all their flaws and quirks.
Even the secondary characters get screen time and you get to know them. Apart from the really nice story/character arcs you get treated to some history/crime lessons. Some events that real happened in Japan are mentioned. But they don't feel out of context, although they don't always really fit into the story, they always keep the movie flowing nicely. For (some) western audiences a few behavior mannerisms might seem odd, but I personally did like the characters, with all their flaws and quirks.