Yokohama Kaidashi Kikou, Shoujo Shuumatsu Ryokou Recommendations
Shoujo Shuumatsu Ryokou is definitely more moe and more apocalyptic than YKK, but the tone of the manga are remarkably similar. Those interested in post-apocalyptic iyashikei would be well served by going back and reading the original of that apparent genre as well as the newest entry.
Both have similiar iyashikei tropes, both also takes part in a post-apocalyptic scenario. Although, Girls Last Tour is more apocalyptic than YKK. They also have similiar mono no aware feels.