"Kanon" is a 24-episode anime series based on the visual novel by Key. The story centers around Yuichi Aizawa, a high school student who returns to a snowy town after a seven-year absence. He reunites with his cousin Nayuki Minase and her mother, Akiko, who take him in. As Yuichi reacquaints himself with the town, he encounters several girls, each dealing with their own emotional struggles and mysterious circumstances.

Ayu Tsukimiya, a cheerful and energetic girl, becomes one of Yuichi's closest friends. She is often seen searching for something she lost long ago, though she cannot remember what it is. Makoto Sawatari, a girl with a fiery temper and a mysterious connection to Yuichi's past, appears and begins living with him and Nayuki. Shiori Misaka, a frail and reserved girl, is often seen waiting outside the school, harboring a secret about her health. Mai Kawasumi, a quiet and enigmatic student, is rumored to fight demons at night, though her true motivations remain unclear. Finally, Sayuri Kurata, Mai's best friend, provides support and insight into Mai's life.

As Yuichi interacts with each girl, he uncovers their personal struggles and helps them confront their pasts. Ayu's search for her lost treasure ties into a childhood promise she made with Yuichi. Makoto's erratic behavior and memory loss stem from a tragic event linked to Yuichi's earlier visit to the town. Shiori's illness and her strained relationship with her sister are gradually revealed. Mai's nighttime battles are connected to a traumatic incident from her childhood, and Sayuri's unwavering loyalty to Mai highlights the depth of their friendship.

The narrative weaves together themes of memory, loss, and redemption, as Yuichi's presence in the town becomes a catalyst for healing and resolution. The series balances moments of lighthearted humor with poignant emotional depth, exploring the impact of past decisions and the power of human connection. Each character's arc is resolved by the end of the series, with Yuichi playing a pivotal role in helping them find closure and move forward. The story concludes with a sense of fulfillment, as the characters' intertwined fates are brought to a satisfying resolution.