Kiyoka finally got a day off on New Year's to spend with Miyo, and it got interrupted by the Gifted Communion, and it is getting worse. Regular people getting mixed into this makes it really troubling.
Miyo has another dream, and we see her mom and a younger Usui. Usui wants to be Sumi's sword, but Sumi proclaimed to be Usui's sheath. That has me curious regarding Sumi's actions. Her going to the Saimori Family could be her way to also protecting Usui. Though I doubt he would ever be open-minded to see things that way. There is a lot of Miyo's dream sight that Arata doesn't know and even adding the fact that she hasn't fully awakened to it.
Now who could be cooperating with Usui as everything with Kaoruko's father really lives with an uncomfortable feeling. Arata and his recent conversation with Usui can be seen as concerning, but he doesn't have the pull. We did see Takaihito's aid referring to him as prince, so he can be a suspect. So him being aligned to kidnap the emperor because of where his true loyalty is maybe?