Chirin is a lamb who lives in the meadows with his mother. He wears a bell around his neck so he can be found in case he falls into the valley. Chirin's mother warns him not to go too far as he could get eaten by a wolf, but the lamb doesn't completely understand. One wolf who lives in the mountains named Uou attacks the meadows in the night, killing all of the sheep except Chirin, who was protected by his mother. The following morning, Chirin, now apparently racked with survivor's guilt, climbs the mountains to confront Uou and asks the wolf to make him his apprentice because he wants to be a strong wolf just like him. Uou is touched by this and agrees to train Chirin on a daily basis.