@Norainhere no. While we don’t know their exact ages, they both seem to be in their mid-twenties, from what the more perceptive fans have been able to deduce
^ Read the manga. It's definitely a yuri. Momo is at wit's end in love with Shamiko, and Shamiko is awakening to something she hasn't quite let out of the bag yet. It's very clear at this point. Now how it will wind up...who knows.
^^ That's because the anime only covers the first two volumes (and half of the first chapter of volume 3). The relationship between them gets much more profound as the story progresses and they become increasingly attracted to each other.