Brave 10 - 12 episodes
The miko Izanami is being chased by assassins. She seeks help from the warlord Sanada who's gathering 10 warriors called Sanada's Braves. It's based on historical characters of the warring Sengoku era. Of course with a supernatural and gender (some of the characters were made into female) twists.
Priestess. Check. Guardians. Check. Bishies. Hmm Check. Romance. Hmmm Check. Reverse harem hmmm no but if you want a shonen version of Neo Angelique meets Haruka meets Hakuouki. Then go watch this. Basically, it's let's-feature-a-guardian-per-episode so we don't get to see the whole gang together and they're all scattered and all. I would have loved it if they had more interaction and more fights. Their powers are cool too. Maybe they're saving that for a second season. It's also going to be adapted into a stage play as reported in ANN.