This manga is freaking amazing and hilarious. I don't know if it's just the translation I read, but the series had quite a few western pop culture references that made me laugh; there was even a Monty Python reference!
The story is somewhat unique and while the art and characters were rather average, my enjoyment of the series was massive.
Although as a warning, this series is practically hentai in some chapters and some things are cringe-worthy if you aren't used to the subject matter.
The ending was a bit thought provoking and somewhat deep until the last fifteen pages or so, but it still makes it one of the most enjoyable series I've read.