第 4 集: 由紀在為菜穗子整理筆記時，回憶起七年前與彩羽的初次相遇。
2006年10月27日 播出
Yuichi reminisces about events of the past seven years ago concerning his first meeting with Ayu. Nayuki makes Yuichi return to school to retrieve her school notes she borrowed to him, and as he is leaving the premises, he runs into a third-year student, Mai Kawasumi, who is wielding a sword. (Source: Kanon Wikia)