I really liked this. The story started kind of cute with some cliche villains, but as I kept on watching it developed a lot. It was sad to see how fate was cruel to Chikane and Himeko like it tried to do everything to tear them apart. Only at the very end, we see that their story does indeed end happily.
I loved the robots and the action scenes, they were a pretty cool addition and not something you would usually see in a Yuri anime. I liked Soma as well, but only as a friend and protector of both priestesses. It did bother me a little that the anime kept on pushing him and Himeko together plenty of times. But even so, I was really happy that in the end, Himeko realized the one she loved was Chikane and not him. And maybe in a way, it was a good thing that he was such an important character with a strong presence because when Himeko rejected him, it showed how much she actually cared for the beautiful moon girl and that she would choose her no matter what. Nothing like way, way too many yuri animes that focus on girls getting in love with girls only when there are no or barely any males around (like that stupid all-girls school trope). This felt much more real, their love much more powerful. I liked it and I definitely recommend.