Just an introduction episode to set up the story. The poster boy wasn't in it and we are really only introduced to the princess. There seems to be some political strife, ongoing natural disasters (which don't seem to be natural at all), some mysterious runes, and some magic stuff (which kind of just inserted at the end). The narrative was a bit confusing because it kept jumping around but the art and animation were pretty good. There is the sword in the stone reference to King Arthur. Not familiar with the source material but I'll give the main show a try but we'll see.