The art is excellent, but that's the only redeeming quality of this piece of garbage. It starts out well enough - a young teacher, a childhood promise, and a sudden reunion - not particularly imaginative, but it sort of made me think of "Love Hina in a high school setting, with adult main characters". But it goes downhill from there, and how!
Apart from that bit, there is no plot to speak of. No real tension, no real development, and not even anything particularly funny. The main female character even sets up a sex schedule. I forget but it goes something like kissing one week, 2nd base the next week, and sex the week after that. They adhere to it strictly. It's about as romantic as it sounds (not at all), as funny as it sounds (not at all), and it even fails at being sexy.
Then there are the happenings at the school, which is full of would-be-molesters, lecherous teachers, each with a more asinine plot than the next in order to get some underage tail. It's sad to read once, and it's pathetic that the author can't think of something different and basically recycles this lousy idea with several different teachers.
Finally, the characters couldn't possibly be more unsympathetic. The main girl is such an idiot, devoid of personality and basically little more than a vehicle for the character to get laid and bring the reader the aforementioned lackluster titillation. The second girl is, again, an idiot, and also quite the slut. I guess it's supposed to be funny, but it isn't - better written mangas have pulled off this sort of character, but it doesn't happen here. And lastly the "hero", who is a typical loser so common to the harem genre, but who completely lacks the warmth that makes other harem main guys lovable, or even tolerable.
This series attempts to straddle the divide between comedy and hentai, and fails at both.