Board Thread:General Discussion/@comment-4631119-20130620223043/@comment-5924243-20130621182238

In another forum post (this one), Ethrundr said this:

"When they started, it's on Spring, and when they reach #19 at the Episode 11, its already around Fall (usual time in Japanese for School Cultural Festival). Since from what I know the Festival usually helds by Japanese schools on October, so it'll be around 6 to 7 months already."

So I assume that the first semester ended by the end of the anime (but I don't know if semesters and quarters in Japan are similar to America).