Sphere, the Knight of Elf

There are no countries. Human, the beasts, elves. Three tribes fight against each other to attain one ring. And those who attain the ring can decide a class system in the society. I'm Osmond. I used to be a famous knight, but nowadays I am just an old man. While I met a person in the travel. That was Sphere, the elf knight. I heard that she is finding the clue that her friend missed... Luckily, we go traveling with each other.