I'm not sure what I would have liked with Umibe no Onnanoko, but as of now I can say I'm disappointed. All I can say about the moral code in Umibe no Onnanoko is that I've seen it done, and better. I struggled through all 20 chapters waiting for something to pique my interest, but I was all but disappointed. Keisuke seems to find no value in the feelings of others, and no interest in living, and that's all the development of his character that I can comprehend. He's depressed, and probably depressed to cater to all those other misanthropic teens out there who might find enjoyment in this book. Koume seems to be an unfortunate girl with the fault of falling for assholes such as Keisuke, and that's really all I can gather.

The ending was less than disappointing and really didn't hold much weight to it, and neither Keisuke and Koume developed more depth to their character. Maybe I'm missing the whole idea that humans are shallow creatures and do not hold much value, but I look for narrative and am left disappointed when I can't find one. The art is fine, not average but not fantastic either, as I've also seen this style in other manga. There were a few disproportionate neck to head lengths, but I'm really just nitpicking with small details when looking at Asano Inio's drawing skills as a whole.

While this is my personal opinion, I still think that Umibe no Onnanoko is a lacklustre manga without story or character development, and that many people would find it to be rather shallow and boring throughout the 20 or so chapters. Maybe some readers might find enjoyment from the sexual scenes in Umibe no Onnanoko, but I really couldn't have cared less. I've seen the whole misanthropic theme done better in loads of other manga, and think that if a manga is a struggle to get through, it doesn't deserve more than 5 stars out of ten using a numerical rating. While it's not completely terrible, I really don't think it deserved my time.