Thats IF there is a third year at Youkai Academy. The rescue Moka Arc could very well lead to the final battle with Alucard because of Hokuto's and Kiria's intentions after Akua is defeated and the Fairy Tale HQ falls.
Those two flat out told them that they want Moka for there plans, as for Tsukune and the rest of the gang they will try to find a way to prevent this to which Hokuto and Kiria would have a backup plan for that.
But with Akua protecting Moka those two wouldn't dare try anything because she would rip them apart, they would most likely make there move after Akua's defeat and then her and Tsukune would team up to rescue Moka, one of my predictions.
