Frankly, as I haven't done much research, I have no idea how this is related to Shingeki no Bahamut besides it being related to Cygames and the fact the end of episode one shows a picture of Favaro and Kaisar. In my opinion, everything from the (main) characters (whom are polar opposites) to the story line (which there is no story) is a completely different feel from Bahamut besides maybe the art. Though one could say that's what makes it unique. Unfortunately there's no real story and we never get anything exciting like peering into the royalty lives of either princess. There's definitely a lover's vibe between the two princesses throughout the show, though it stays PG13. I guess we'll leave that to the people of the doujinshi world. To me, Manaria Friends wasn't bad per se, but it wasn't amazing. If I were you, I wouldn't go into this expecting much out of it but to just watch it for fun.
Who I'd recommend this to: anyone who wants a quick watch for a chill nonsensical slice of life with some magic in it. The show isn't very intense and is pretty lax throughout. There's some points in the show where they try to mislead you to make you think another way, but that's about it.
