"Kanon"s story revolves around a group of five girls whose lives are connected to the same boy. Yuichi Aizawa is a second-year high school student who had visited the city where the story takes place seven years prior to "Kanon"'s beginning. The story opens on Wednesday January 6, 1999 when Yuichi arrives in the city and is very detached from it and its inhabitants. Prior to his return, it is decided that he is to stay with his first cousin, Nayuki Minase, and her mother, Akiko. After his long absence, Yuichi has forgotten almost everything except minor details of what happened seven years before and is in need of being reminded of what he left behind. Nayuki initially tries repeatedly to jog his memory, but is unsuccessful. Throughout the story, as he learns about the supernatural undertones of the city, Yuichi is reminded of the events of seven years ago.