In this episode, Zero, Kirinmaru’s sister, steals Miroku’s sealing abilities in order to remove the seal he placed on Setsuna. Without it, she can’t control herself and runs away, leaving Towa and Moroha to chase after her. 

I really like this one but I really think that it resolved itself just a little too fast. I wish we’d had more time, like maybe one more episode for this plot to play out and Setsuna gets brought to her senses the seal redone at the end of a two-parter.