I've read three chapters of the manga Reset!, which takes place in the same world as Yuru Yuri. Each chapter's cover seems to be a reference to some other work. For example, here's the Chapter 3 cover:
Which is a reference to this famous Kanon image:
Here's the cover of Chapter 1:
Which I believe is a reference to this Little Busters image:
Here's the cover of Chapter 2:
I cannot figure out what this image is referring to. Since the other two were works by Key, I checked into Clannad, Air, and Rewrite, but none of them seem to match that logo. Does anyone recognize this image?