To Your Eternity Fumetsu no Anata e English Subbed

In the beginning, an “orb” is cast unto Earth. “It” can do two things: change into the form of the thing that stimulates “it”; and come back to life after death. “It” morphs from orb to rock, then to wolf, and finally to boy, but roams about like a newborn who knows nothing. As a boy, “it” becomes Fushi.

Through encounters with human kindness, Fushi not only gains survival skills but grows as a “person”. But his journey is darkened by the inexplicable and destructive enemy Nokker and cruel partings with the people he loves.

(Source: Crunchyroll)