It's a good continuation to season 2.
This episode is basically about Team Delta's celebrating their new year, some backstory, and development. Other than Momoe, the other MC got very little screentime. But they got their part of story.
It has a lot of funny moments as always.

I was wondering who's gonna end up with Momoe (i was expecting Matsuda). Well i don't think there's really an answer but that was a good hint.

Overall, as a special episode it did it's job.
But i can't help but thinking, it feels really short and i still want more of studio delta team (≧▽≦)