Im not really a great fan of the first one, but i have to say the art style is kick-ass. Hirano Aya's voice was awesome, and so as Chiwa Saito as Mel.
But Kugimiya Rie, Tanaka Rie, Fukuyama Jun and Kato Emiri.... I thought first one had kick ass voice actors but i think 2nd one is beyond that...