User blog comment:Usagi Kawausa Hishikawa/Fan Letter Submission Area!/@comment-26809367-20161207210400

Dear Prism Force no min'na-san, I'm one of your biggest fans ^^ I love how you're great idols depsite everything that's going on :3 But it might be just me. Ahah, sorry, a lot of stuff has been going on ^^"

I can't wait to see your next lives! You're one of the best units out there!

Fight and keep being amazing so that you cheer us down there up too!

--Anonymous Lucky Seven

...It's obviously Nana Shirogane XD