Attack of the cakes! What can I say, we’ve already seen this premise before. Of course there’s also what we can call the “main plot” of the series. We have someone trying to unravel the mystery behind Ai and her “service”. Then we have a girl who is somehow connected to Ai. Personally I would rather have them focus the entire episode on the main plot than give us more of these “one-shot” stories. The subplot wasn’t bad, it’s just nothing we haven’t seen before. They will probably devote entire episodes to the main plot later in the series, but for the time being I think this sort of episode will be the trend we see for a while.