Oh my god, I just saw half of Season 2, and I'm completely baffled! Here are my comments until now:
1. I do NOT ship Jean x Lilly anymore. First of all, I prefer Jean x Dara. Second of all, Lilly in Season 2

. I'm terrified right now. And it would be just cruel to ship that girl with Jean after everything she did
2. I now know what's up with Tetsuko. Hint 1: He's not the same person as Yuuma, but I was right that he was hiding his identity for a reason. Hint 2: That one scene with Naoki and the twins is pretty much the only scene where Daini appears without Tetsuko, so I saw that as a huge hint that Yuuma might be the same person as Tetsuko, but you know who else was in that scene? Exactly: Lilly the janitor. It should have been obvious that an attractive 19-year-old girl would not randomly decide to be a janitor at a high school, but of course none of us even noticed anything fishy about that, because random characters are often young and attractive in anime

.
3. Piefan, I don't know how on Earth you came up with Daini x Lilly, but
it was canon all along without anyone realizing it 
. How did you know?
4. New characters. I like Dara, and Rocco is cute and funny. I also like some of Kitti's siblings.
And Lilly is technically not a new character, but she was/seemed like such a minor character in Season 1, and now she's a scarier and more believable villain than both Naoki and Mr. Maki, so my shout-out goes to her as well ^^. (even though I love Naoki as a funny exaggerated character) However, I found a few of the other new characters rather disappointing, especially Sachiko. What was her purpose even supposed to be? ImA really didn't need another cheerful female character: we already have Jean, Yuuna and Mana-chan! And while Jean has a fleshed-out backstory and a unique personality, and Mana-chan is cute and interesting, Sachiko just seems like the most superficial character ever made… What was ImA thinking? -.-' But I won't complain, because for the most part, what I've seen of Season 2 was great, and I haven't finished yet, so maybe Sachiko will have some sort of purpose…
5. I'm also happy that the twins finally got their own episode. I always found Yuuna a little boring in Season 1 (though I thought it was cute that she made friends with Mana-chan), but I like her better now. And I know now why Yuuna joined the team and Yuuma never did.
6. I'm really curious what's going to happen next. Is someone going to die? There was a rumor going on that Yuzuki would die in Season 2, but I think that was only because she has white hair (someone said white-haired people often died in anime, so then people were joking that Yuzuki would die).