People take a while to warm up. At a concert everybody has been queuing for hours and then heard canned music for a while before anybody appears on stage. These kids were ushered into the gym in the middle of the day and had no idea what was coming.
Seeing them in that gym made me wonder if stages usually have sprung floors. Otherwise even in trainers the dancing would get to your knees.
After each introduction they'd planned to say what's it's like to do this first surprise visit. Shiori completely forgot, and Reni called her out later.
^I feel bad everytime i see that cover. I want the LP (vinyl) so badly /please so much that refuse to buy the CD version cuz LP's are cooler and make better showpieces haha.. but those things come up to 10,000yen in final auction prices. I still cannot justify that much money on a single album :/
on another note, i'm proud that mcz has an album cover worthy of recognition. tbh, a lot of their recent cover designs have been pretty good and sensible :)
Mikakunin Shoujo is a sitcom about an agency (Akari plays the office help) trying to produce a group called Unidentified Fantastic Idol (who I don't think ever appear on screen).
Your link is the tie-in radio show where MomoClo play the UFI members. Their debut song "We are UFI" is on the Santa-san single.