Strange email

 In chapter 2: "The Athletes Arrive" we see a unknown person send an email to Jestress:

"Those people must view the boys and girls of the Aerial Augmented Infantry as the most interesting guinea pigs in existence."

"If I remain concealed here, they'll surely try to contact me in some way."

"If anything happens, I'll report on it immediately."

One message has been sent to "Jestress"

The last line has colored text which seems like a pretty obvious clue, since every single gauntlet knight has their own kizuna text color.

The color used is #ffdbdb

which is almost the exact same as the color Naima uses which is #ffd6d6

Here are the two colors side by side:

Naima's cpp?

Here is a comparison of Miyao's color and Meow's, still the difference is much more visible than in Naima's case.

The only other characters whose kizuna color's we never saw are Jestress and Okonogi. 

Jestress fits because her clothing is the same color as the text and that generally seems to be a theme for the colors with them being the same as the characters clothing or hair color, however it makes no sense for her to be sending an Email to herself.

And Okonogi wears all black with black hair so it makes no sense for him to have a pink text color unless he has a hidden side to him.