The Adventures of Black Sheep

When he wakes up, a boy suddenly turns into a black sheep, and wonderful adventures will happen to him. The male protagonist met a strange girl who predicted that someone around the protagonist would die. This incredible prophecy later became a reality. An even more incredible thing happened. The girl actually asked the male protagonist to travel with her. The purpose of the trip was to save a black sheep. So what will be the outcome of this trip and will the protagonists be redeemed.