A new manga has been started under Shonen Jump by the name of "The Hunters Guild: Red Hood"(レッドフード).
Basic summary is that a boy travels with a girl named Grimm who is a professional Hunter who hints down monsters, especially Werewolves. The girl here grows into an adult everytime there's a battle ensuing.
https://www.viz.com/shonenjump/chapt...guild-red-hood
The manga has the Kurohime vibe to it, so let's look forward to see more of the transformation and a fun story.