Caramel Kitsch Yuugekitai

Caramel Kitsch Yuugekitai (カラメルキッチュ遊撃隊) is a manga series by Masaru Ooishi. It was serialized in Young King OURs.

Plot
One day, a blue moon appeared, and all the cities and most of the people disappeared. Now the children that have been born since then are 13! The tale of the strange and slightly painful days of three middle school girls in the countryside.