Time for another Anime Diet Top Ten ELEVEN List! Because 11 is one louder than 10.
What defines Aika Zero? The fact that it deliberately imitates fetish porn? The fact that the overarching target for the first story arc is a giant phallus, which must be destroyed before it succeeds in emptying its fiery load? The fact that the show goes further than the original Aika, blurring the line between titillation and parody of pornographic content?