Kanon - Season 1 Episode 12 A Mark of a Dream
Overview: Yuichi remembers what happened to Ayu, seven years ago, as well as the thing she was searching for—a little angel doll. Nayuki, Kaori, and Jun help him unearth the doll. Akiko is hit by a car in a blizzard. Ayu, in order to let Yuichi use the doll, asks him to let her go as a final wish.