What the heck happened? I get Sakuya was getting her revenge, but that's all I get.

MezzoDragon said:
What the heck happened? I get Sakuya was getting her revenge, but that's all I get.

Note the hairstyle changes. Basically:

"My haircut is grim and austere, and therefore so am I!" → "Screw that noise, babe, you're a recurring STG player character now! Let's jive!" → "I now vaguely resemble a flapper girl!" → "CURSE YOU YOU REBELLIOUS CHILD" → "Woe is me and my lone tear of sadness/bruise from being poked in the eye in the last panel!" → "Riiiidiiii, Pagliaaaachioooo!" "wat"

MezzoDragon said:
What the heck happened? I get Sakuya was getting her revenge, but that's all I get.

Sanae was all like "Let's get you a haircut!"
-get's new haircut-

Yuyuko yells at Youmu either for getting a haircut or having an 'inappropriate' one? I'm not sure here.

-reverts hairstyle-

Turns out Yuyuko was really just a spiteful Sakuya in disguise.

Also, no Remilia tag? For shame~

The Question is... where is yuyuko?

That Yuyuko is a Spy!

That's not cool, Sakuya...