Shiroi is the last of her kind, the only survivor of the cruel centaur-war. The centaurs were once enslaved by the human societies of her homeland and they misused them as mounts and beasts of burden. Then the centaurs revolted and a long lasting war emerged which ended in the destruction of all humans, most centaurs and nearly the whole continent (imagine magic spells which have the destructive power of nuclear warheads...). Shiroi wandered a long time without any goal through a barren land with perverted magic and creatures created or perverted through this magic. She just tried to survive. Later in the story she meets the phoenix Hoo. The centaur-war had destroyed his 'Sacred Place of Renewal' so he couldn't become reborn and was slowly dying (This is the basic idea of the story. I still have to define the outcome of it).