Despite being listed as a Comedy Detective Mystery Drama, it's really just a Comedy that happens to involve Detective work. As mentioned in the comments, there isn't really a plot besides the two main characters solving mysteries together (with Hiratsuka being the Sherlock-esque character and Saionji being his Watson), although we do learn a tiny bit about Saionji's background, mainly revolving around his adorable girlfriend, Emi-chan. Aside from that, however, it's basically just a stereotypical Detective drama involving random cases and tons of Comedy. That doesn't mean the show isn't good, however. The acting in this is superb, and honestly something I did not expect from a Comedy-oriented drama. All of the characters are played extremely well and it's really hard not to like any of them. Since this isn't a super serious drama, you shouldn't expect tons of heavy stuff. It's very light-hearted and some bits are purposely over-exaggerated for the sake of the Comedy aspect, however it's all very well done so it's by no means annoying or anything like that. All in all, if you like Crime-related Dramas and Comedy, then you'll thoroughly enjoy this. It's perfect for those looking for some good laughs or people who just want to break away from super-serious dramas for a little while.