A filler episode was bond to show up but it's one that is nice to have.
What makes this episode interesting is the perspective we are watching it from. How do the other characters feel when they see Yu going around forming social links and what would they do about it. Its a nice break from the usual events of how the social link breaks down as Yu goes through them, which will be shown next week. Of course the main star of this filler episode was Nanako and dressing up as a Magical Detective Girl. It was mostly of her being all cute and stuff but it also shows her worries over what Yu and have her interact with old characters from pass episodes. There were some nice throw in cameos like the Shiroku Store Owner, Smith master and turning out to be a fire works person, Master Daidara, and F-ing Fox!
Since we are half way through the Persona 4 anime it is time for a change up of Opening and Ending (I assume it will change next week). The new opening, from both a visual and song aspect, are both well done and fitting with the series style. However, a few bits are of footage from the last opening but I assume that is due to lack of time to make some new animation and will most likely change later on or on the DVD/Blu-ray. This weeks ending is more specific to this episode featuring Nanako, some cute drawings, and a happy little song from Chie (No really, Chie (Horie Yui) was singing this).
After watching many filler episodes in my life time of animes, this one works out in the end since it keeps itself in the logic of the series and connects to the currents events as we see them from Yu's perspective next week.
Magical Detective Nanako, GO!