Kanon is a Japanese adult visual novel developed by Key for Windows PCs inThe game is a story-driven adventure game that follows the life of Yuichi Aizawa, a high school student who returns to a city he last visited seven years prior, and has little recollection of the events from back then. The game features pre-determined scenarios with courses of interaction, and focuses on the appeal of the five female main characters by the player character. Kanon has sold over 300,000 units across several platforms, and ranked as the second best-selling PC game sold in Japan.

Kanon has made several transitions into other media such as manga series, comic anthologies, light novels, and art books. Toei Animation produced a 13-episode anime television series in 2002 and an original video animation (OVA) episode inKyoto Animation produced a 24-episode anime series inThe 2006 anime was licensed and dubbed in English by ADV Films in 2008, but the license was given to Funimation after ADV's closure. The game also features Pachelbel's Kanon D-dur or Canon in D major as a background piece at certain instances throughout the series, playing on the association between Kanon and the musical term canon.