Woahhhh I also had just finished this one, and seeing this really reminds me that I should really review it soon. I didn't expect that the soundtrack of this anime would be like that—I mean the setting is Edo Japan so I thought they would use the usual traditional Japanese instruments for the background music, but no! Hip-hop music became the center of their soundtrack. At first, I found it weird because I'm quite not used to it, but soon it perfectly blended with other aspects of this anime. It's really a nice watch and like you, it felt like a pleasant unexpected trip. Thanks for sharing such a nice review!