Very nice find! The art was a very good first impression - the girl's really cute, the guy is very well drawn, and even the background art is stellar. I've seen some of his H-related works so I'm not surprised that the art is so good.
What really surprised was the storyline. There's dark elements along with some witty humor. The Yuuko is sly in cute way and she always catches Teiichi off guard. I totally agree that Yuuko gives off a Senjougahara vibe. Not a bad storyline for a H-mangaka.
I'd definite want to continue to follow this series!
2nd manga that I enjoy from a H-mangaka - 1st being High School of the Dead.