The credits identify her as "Kiryuuin Ragyou", so the character tag has been changed accordingly.

Xarams said:

The credits identify her as "Kiryuuin Ragyou", so the character tag has been changed accordingly.

works for me. I was actually curious if her last name was Kiryuuin or not as of moment.

+++++++

From Trigger Magazine #007:

Satsuki's mother also makes a quick show in this episode. Can't reveal too much yet, but she will for sure to be an important character to the story!

皐月のお母さまも今回チラっと登場。今後どのように関わっていくのかが非常に気になります。

I'm so hyped to see Romi Park voice a main villainess.