Can't sugarcoat it in any way, the last arc was bad as well as unnecessary, felt more like filler than part of the main story.
The rest was pretty decent though, hardly a great manga but good for some casual entertainment.
Also, UD was quite the charming fellow, I couldn't help but hear Show Hayami's voice while reading his lines.
![Stick out tongue :p :p](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)