I just realized that this is a reference to the limited time colaboration Umamusume will be having with a energy drink brand celebrating their app's 1st year anniversary. lol Expect to start seeing more Zone x Umamusume art in the near future. ^ ^

here's a few articles explaining their plans of sales early 2022.

https://prtimes.jp/main/html/rd/p/000000011.000074677.html

https://animeanime.jp/article/2021/12/20/66274.html