This was a good mystery, but it felt too mechanically told for it to be truly great. There wasn't any real shock factor or emotion, and certain physical descriptions (especially when explaining the murder) weren't very clear.  
 
I also found it difficult to remember all of the character's names and got characters confused with one another as I'm not overly familiar with Japanese names. This meant the impact of certain reveals wasn't as great as it should have been. Obviously, this isn't the author's fault, but it did affect my enjoyment of the book. If I were reading this physically, I would have been checking back to the character list at the beginning of the book, but I couldn't be bothered to do so while listening to audio. 
 
Speaking of the audiobook, it's unfortunately edited pretty poorly. There were a LOT of fumbled words and some awkward cadences that were left in that really should have been rerecorded. There were also some really clumsy, obvious cuts, as well as some random sentences that were very low in volume compared the rest of the audio. It was clear that these issues weren't characterisation choices, but simply sloppy editing. In addition, at the beginning of the book, the narrator addressed us as 'dear listeners' which I thought was a nice touch, but towards the end we were addressed as 'dear reader', so they inexplicably didn't follow this through to the end of the novel.