Orniletter
Banned
FE:A was out-sourced to Red Entertainment. They also did, among other things, the Fossil Fighter games on DS with SPD, but the 3DS game was given to Marvelous.
I´m skimming through the google translated page, but it looks like their involvment was very limited:
"In our Red ENTERTAINMENT
I was responsible for part of the "scenario" and "illustrations".
(2012/5/2 Updated)
The "Harvest Festival of ties" additional content "1, 2, 3 future of despair"
I was responsible for some scenario "summer of bonds" and "hidden spring of bonds."
(2013/2/4 Updated) "