The original manga series by Hajime Musashino began in 2015 in Manga One and Ura Sunday and has thirteen volumes to its name so far and is ongoing as of the anime announcement.
The series has set Kazuya Ichikawa as the director with Yuuko Kakihara handling the scripts with Midori Gotou.
That announcement was light with details but since then we also learned of a spring 2021 premiere for the show.