The new season does many of the same things as the previous. There's more of the supernatural, more cultural insights, and more social commentary. Ghosts, spirits, and psychics all return en masse, escorted by Mahjong lessons and the depravity of internet media.
Kei almost did everything the first Holic did brilliantly. "Almost" because there was just one element I found lacking compared to the original. There was decidedly less of the extremely creepy vibes that resonated from the first Holic. I wanted Kei to have its scary moments just like its predecessor, but alas, there were none. (Of course this is also the most subjective opinion I have up here, so don't take it for granted.)
However, Kei did well in respect to bringing up some more social concerns just like the first season. One small example being the introduction of Watanuki's newest friend, Kohane. Through her, Kei gives another candid view of society and how the problem of prejudice affects people. Of course, this wouldn't be xxxHOLiC without more mind-boggling questions about fate, destiny, and choices. They're another integral part of the anime, helping to make the story even more compelling.
With respect to the plot, Kei started off on the wrong foot for me. The very first story arc seemed rushed, with too little preamble to make the flow natural. Yet in the overall scheme of things, it became clear that the individual episodes were once again the agents of character development. This realization made me appreciate how the plot was truly structured, and to other viewers, the slightly rickety pace will become clearer as the series progresses.
Hence, moving on into character development, it has to be said that there was remarkably more in Kei as opposed to the first Holic. True, Watanuki still performs his insane stunts of protest against Doumeki's stoic nature, and Himawari still comments that they're the best of friends. However, Watanuki does develop, changing the group's dynamic considerably throughout the course of the series. As for Yuuko... well, she's still a combination of a serious all-knowing psychic goddess and frivolous alcoholic, but that's just another one of the reasons I can't stop watching.
In the fields of art and sound, much of Kei is similar to its predecessor. People still have arms and legs that are a little too long, but the artwork still retains its great quality. Heck, even the food looks appetizing.
It turns out that there were some differences in sound, but only with the opening song. It was a little more upbeat than the old one, and definitely retracted from the ominous ambiance. Other than that, I still considered it quite catchy.
Regardless of all of the above, I was glued to this show and couldn't let it go. I laughed at the comedy, shivered at the creepy parts, and felt sad whenever misfortune fell upon the characters (well, not really). Anyone who loved the first Holic absolutely must get their hands on Kei. And while they're at that, let's all keep an eye out for a third season.
