The specials were actually better than the anime itself.
These short episodes felt much more entertaining. I don't think you need to watch the series for the enjoyment of the specials, they're very cutesy and a joy to watch.
There wasn't exactly a story, just Youto and Tsukiko presenting their own little show talking about pictures of the other characters. Tsukikos voice actor was mainly enjoyable. With only two of the main characters, actually makes these fun shorts entertaining to watch.
The only thing that bothered me was the cliche "you're a pervert" that Tsukiko always says to Youto and him usually denying it, or going a
long with it. His same usual character. It got really old, really fast.