Yokohama Kaidashi Kikou, Non Non Biyori Recommendations
I've only seen the first three episodes of Non Non Biyori, but it immediately reminded me of YKK because of its laid-back slice of country life appeal.
The girls are cute and I love their curiousity and discoveries through out each of the series. NNB is a bit "cuter" though.
Both have a laid-back atmosphere and took place in an almost quiet area. They all bring a relaxing atmosphere even though there isn't much of a story in them.