Kanon is a Japanese visual novel developed by Key, first released in 1999. It follows the story of Yuichi Aizawa, who returns to a town he visited seven years ago and begins to unravel forgotten memories and encounters several girls with whom he shares mysterious past connections. The series is known for its touching narrative and emotional depth, exploring themes of love, loss, and memory. It has been adapted into multiple anime series, with the most notable one released in 2006.