Anyone Know What This Anime Show Is?

I watched it a while ago on on demand. I remember there were a bunch of teenage girls (clearly) with birthmark things. those marks enabled them to summon these creatures and they had to fight each other. and then marry some guy. But the fighting was between the creatures, and the creatures had to die, which really affected the girls, i think sent them into temporary comas. in the end they fight the guy that put them through it all...anyone recognize

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