Mai Kawasumi is a mysterious and reserved high school student in the visual novel and anime series Kanon. Known for her exceptional swordsmanship, she often patrols the school at night to combat invisible demons, a task that isolates her from many of her peers. Despite her cold exterior, Mai is deeply caring and protective of her friends, especially her childhood friend Yuichi Aizawa, the story's protagonist. Her struggle with the supernatural and her quest to protect those she loves form a significant part of the series' emotional depth and intrigue.