I was fine with the ending except for the last page. Despite some people saying it's definitely one or the other I can't tell from the wedding photo. The child with her mother and father looks like it is Kenichi and Miu's. Well, I'm going to stop looking at different manga sites for the wedding picture.
In the one I originally read the bride's hair is brown/orange. When I saw everyone saying "same color hair as miu" I looked at a few others sites. Also, the chest dimensions of the bride are not miu's. We've seen enough of her boobs to know it's almost impossible for them not to stand out.
So yeah, I'm confused. But hey, it's over, I'll leave it slightly ambiguous just like the author seems to have wanted.