This one and "Passage Hen" don't really hold up compared to the original series, or even Shin PSoH (which is itself not as good as the original), and IMO the problem is the lack of character development. Unlike with the original series where Leon and D's relationship developed over time and more details of D's character were slowly revealed, in this series we know the backstory of the D people so the focus is only on the "animal story of the week". All of which are fun, but it makes the series purely episodic, without a conclusion.
However, they're still a fun read and as a big PSoH fan, I am very glad these spinoffs were finally scanlated!