I won't give a lot away but K stands for Kings but not like a king on a throne but different. The graphics in the anime might be the best I've seen in an anime and the story though keeping secret from the viewer a lot of the story that you'll learn later is still a good story. This is one of my favorites. Episode 1 dubbed linked it to Poaltube. https://tube.poal.co/watch?v=M7mXpKNU5Vo