Well.. you've asked your question in the manga section rather than the anime section. But no there are no more episodes. Second season ep 12 is the last one. The second season was pretty disappointing in that it was just a collection of random sidestories (though it did cover Tina's preliminary arc).
The manga goes much further (there are 14 volumes published in America now with 3 more to go) and it is starting to resolve many of the plot threads. I'd suggest reading those if you want more.
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