The current game event is apparently Easter-themed, and Sakuya has been recruited to be a performer of sorts, wearing a combination of a bunny-girl outfit and a magician's outfit. She looks pretty sharp!
Somehow a giant (like taller than a human) egg wound up sitting by the big tree in Hakugyokurou, and Saigyouji Yuyuko wants to hatch it to see what comes out. (What could possibly go wrong there!?) A bunch of random stuff that would take too long to explain leads to a bunch of the characters wearing bunny girl costumes. Hilarity ensues.