Silver Overture
Yuichi Aizawa returns to the snowy town he used to stay as a child seven years ago, under the roof of his cousin, Nayuki Minase, and her mother, Akiko Minase. Nayuki reintroduces Yuichi to his surroundings, during which, other characters are introduced to most of the main cast (if only in passing).
Aired 06/10/2006EP 1 - Silver Overture

Kanon (2006)
As a young child, Aizawa Yuuichi had often visited his cousin in the city. However, something drastic happened to keep him away for seven long years. Now, Yuuichi returns, his memories of those days are simply gone.
Settling into the wintry town, Yuuichi comes across several young girls, all of whom are connected to his past. As he befriends them and continues to interact with them, the long forgotten memories from his childhood begin to resurface...