Cool concept and the plot is intriguing.
Some of the text box is kinda hard to follow (example: on the 4th/5th? page when the lightning hit the tree I read downward instead of the left box because of the dark tone of the leaves making me think the 2 panels are connected this is very much a nitpick so don't worry!!).
Character designs are very cute but had I not read the description I would've thought Ryujimi was the Ox (mostly because of the horns and her big fluffy ears being obscured by her bangs in the comic).
These criticisms are not that big of a deal and I enjoyed the comic which is the important thing. No doubt you will only improve your comic making skills as long as you keep developing this world and this story or create new ones I don't know...
Maybe I'm being too hard on this prologue sorry I am very tired while writing this review. I'm talking out my ass sorry this is coming from a dude who reads like 10 mangas...