Not every story has a happy end, but most mangas show that they do, in some form. The way this manga portrays true life is somewhat sad, but mostly not unexpected. I love it for it's simply story, but intricate characters. I would've loved to see more development for Yuuji's sake, but life goes on whether you're happy or not, whether you got what you wanted or not.
Kono Koi ni Mirai wa nai