The concept is alright. There's the stereotypical "boy-who's-a-complete-wimp-around-girls-and-embarassed-of-his-own-sexual-urges" protagonist, but he's given a female interest who is an odd but forceful character, something that adds a bit of novelty. There's apparently some psycho-physical connection that occurs between these two and their drool. This is something which only requires a slight suspension of disbelief to enjoy, but the transferring of pain/cuts/bruises later on in chapters is a bit much. A few more hours in the mangaka's head could have fine-tuned the basic idea.
I found the gags funny for the first 15 or so chapters. The gags made full use of the concept's novelty, too, and were refreshing. But to be honest they really start striking like clockwork and after a while you know exactly when a specific gag is going to be used. Open mouth, insert finger, oh-no-what's-this-warm-feeling, scissors, oh so that's what you're thinking about, don't hug me, scissors, hey you don't hug me. This is where I have to agree with "hamburgers" review. It's ridiculous to have to ask your girlfriend for a hug. Not to mention most adolescent couples can't get their hands off each other. From what I understand the manga does this to create tension and to keep you reading: the girl states early on that the protagonist will be the one to take her virginity, so we, the reader, are kept wondering every step of the way when it's gonna happen. Every hug, every touch, puts the reader on his toes. Unfortunately, the ungodly amount of finger sucking required to churn the character development in this manga makes it frustrating to read, especially as you witness the protagonist forbidden from basic things like hugging and calling his girlfriend by her first name (I know the first name business is a japanese thing, but I'd say sharing entire emotional states is intimate enough...give the boy a break...). Sometimes I think this manga is just an overblown, elaborate parody of the whole "wimpy teen protagonist" genre.
The art has some personality and works to the gags. It's nothing special, but it works.
The pacing in particular has some issues, but I'd say this area depends on your tastes and how long you can put up with the protagonist per read.
Overall, I found myself reading this and enjoying it, despite my nitpicking and frustration. I'm hoping some interesting twist comes (that moon in the backgrounds comes to mind) as far as the mystical drool (no aliens, please), but I'm not getting my hopes up as this manga has been pretty light-hearted, aside from the fan service drops here and there.