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Second Season of Kyoukai Senjou no Horizon Due in Summer 2012 [Confirmed]
According to Animedia official website, the information of the second season of Kyoukai Senjou no Horizon hasn't been confirmed yet.
According to Animedia magazine, the second season of Kyoukai Senjou no Horizon
will be aired from April 2012. The two-season composition of the anime had already been announced before the airing of the first season.
Source: Scan of Animedia