Wrote a review on this, here it is:
https://terrenceswiff.wordpress.com/2016/05/27/touhou-ibarakasen-wild-and-horned-hermit/
Some summary: if you haven't played the games in the series you might be completely lost what with all the cameos. On the bright side, the manga-original and title character Kasen is new so it's not as if you'll have known about her from previous entries in the series. Furthermore, it's largely a comedy so that helps. That said, this series has a little bit of a problem in that things rarely (or NEVER) progress, but if you can accept it as a silly series about Reimu Hakurei being a scam artist, you can probably live with it. I wouldn't recommend reading the series all at once, though; it might wear you down with all that build up over Kasen's mysterious nature but no actual payoff. It's gotten better lately but... still has the "nothing happens" problem. Eh!