Depends on which opening(s) you are talking about. Some of them have the same as the RAW, but let's not go into detail about them.
episode 12:
Spoiler:
Shana didn't really think things through and blurted out her reply to the challenge by Kazumi, did she?
The twins are really scary. Seems that twincest is not the only thing that makes them 'frightening', but their coordination as well as their combat abilities, causing Shana to lose terribly. One thing puzzles me though...Where's Sydonay gone to?
From the preview, seems like our favorite busty blonde is back in action, and this time with Yuuji in tow. Looks like Shana's sword is taken by Sorath as well. Whatever it is, I look forward to an action-packed episode 13.