Chances of both shows getting a second season are pretty low... but all considering, NGNL had way more popularity so there's more chance for NGNL to get a second season than Mahouka not to mention budget for a 12 ep that's more succesful vs 24 episode show that's not as successful...
EDIT: Nevermind that, apparently Mahouka had a lead of 3k DVD sold vs NGNL