I was going to wait awhile before reading this but I jumped the gun(just like this manga does) and read chapters 1-10 so far.
First off, this isn't a romance manga. But It's biggest problem is that it's dry.
The manga is inconsistent. It lacks humour and silliness but what prompts the girl to rush things along is ridiculous. The girl herself comes off as dumb despite her preference for straight explanations. The manga starts off with fan service but then that's dropped, and then it's a random baseball game that just wastes time, and a random trip.
The way the parents are presented are like thinly veiled stand ins. But their extremes with the mom being portrayed unfavourably. I have no idea what type of parents would use stork stories, but I doubt any parents wouldn't explain the basic of it coming from a man and a woman in whatever simple way. It makes me wonder if the father isn't some author surrogate.
This manga doesn't have the humour, and subtext of Miyuki, the direction and goal of suzuka, the seriousness and emotion of Koi Kaze, or the appeal of my little sister can’t be this cute. Overall I'd say its style matches closer to Suzuka's but the guy doesn't have the boyish manliness of the boy in it(the build and shounen hero-esque look to him). And while being an athlete or perfect might seem fresh, shoujo already does it, Suzuka did the athelete more evenly. The kid just does not look handsome.
It amounts to a porn story without porn or an internet poster's ambivalent, and thoughtless reaction that they can sum up in one sentence.
At one point the girl asks some dude about incest and he has a ready made answer, like this happens all the time. I imagine this is just an excuse for another character to be the author's mouthpiece, which he beats you with over and over, from all directions, pretty much destroying any tension. His answer is ridiculous though, which shows the amount of thought the author is putting into it(zero). It was based on economics, except humans, like all animals, comes from a subsistence living background. Back then someone wanting to sleep with their sibling would have been odd, and gross mostly because nature makes it so. But beyond that there are perectly rational reasons not to, beyond genetics. For one, it often takes the form of rape, which I'm sure was even more prevalent before, if anyone rememebers the amish scandal where it came out that brothers and fathers were raping their sisters/daughters with the girls having nowhere to go. Now it'll take the form of emotional abuse or manipulation. If someone wants to help their siblings, then they should do so by showing them how to reach their goals(along with advice,encouragement ect).
It's easy to misinterpret emotion, and my post might seem angry. But what happens when I read this manga, is that I'm rolling my eyes while being bored.
I can't say that people won't like this. The average forum goer might agree with it's constant message since it's very internet age. But it's dry, purposeless, and inconsistent. It's too grounded that it makes the random bouts of ridiculousness from the characters seem out of place.