I see Akizuki Ryou and Minase Iori on the back

So do I, but it wasn't explicitly tagged. However on the next chronological picture, you can start to see Ryou's name on his nametag, so I'll tag both anyway.

If the blond girl turns out to be a guy, too...

So wait.. Is the blonde a guy also?

...then whatever comes after the subsequent image should be interesting.

Surprise Idolmasters!