Country Girl: "TRianThology: Alice in the Country of the Three-Sided Mirror" (カントリーガアル「トライアンソロジー～三面鏡の国のアリス～」より) is a manga adaptation of the Country Girl story from TRianThology drawn by Tatsuhiko.
Country Girl was first published on the NicoNicoSeiga online manga platform from January 21 to October 28, 2016. It was republished in Square Enix's Big Gangan Okawari magazine. Two tankobon volumes were released on July 25, 2016 and December 24, 2016, respectively.
A French translation will be published by chattochatto in 2021.