This drawing is from the March 2020 Collection "Primal", Check this post to see the complete collection
"After the timeline collapsed by a failed time travel, the universe reborn into a Primal reality. Kobayashi-san found a new destiny, A Titanoboa caught her, and transforms her into a scaled soilder. Kobayashi, the scaled soilder, is ready to help her mistress, to find food and more aspiring soldiers"
