I really hate it if a mangaka wrote a lot of chapters just to turn his complete work into shit with the last few pages.
Stretch was really nice, I didn't need any Yuri, but the ending made this manga so damn worthless and all I feel is I wasted my time on reading this. I really Hope this gets a sequel. But then again, ain't this author known for not ending his works or just turning them into shit? Maybe it's time to put him onto my block list...
Well, tbh this kind of ending is kind of expected. Look at how shou represents the important chapters in the past. He was pretty much clear that they (ran and keiko) wouldn't be doing romantic stuff in the Manga itself. Everything was pretty much open for our imagination.
IMO, this ending fits with the whole theme of the Manga. It's light, fun, sometimes a bit serious, and not complicated.