Kiy: Son of the Forest (Jumoku no Musuko) Vol. 2:

Chi surrounds & permeates the world itself, as it does each living body upon it. For the most part the Chi balances itself but sometimes it does need help. There are those whom the Chi itself chooses to take up this task on its behalf. By accepting this, they also elect to become intertwined with the very forces they promise to protect. Much as one would with a lover, the relationship changes both involved.