There are recurring themes that appear throughout the story. A music theme is present, as the episode titles from the 2006–2007 anime have parts in their titles related to music, such as overture and introit. Miracles play a large part in the story; "Kanon"s plot line and characters are influenced by various instances where miracles occur.Translated quote: "It's called a miracle because it doesn't happen."</ref> The act of promising and keeping promises is found throughout the story.Translated quote: "It's a promise."</ref> Yuichi eventually makes important promises to the five main girls while at the same time fulfilling past promises he had made with four of them when he used to visit the city as a kid.