Yuichi's High School is the school where Yuichi Aizawa and most of the other cast members of Kanon attend. It has been noted by several characters to be quite large, and this causes Yuichi to get lost on his first day there.
The uniform of the female students have different colored ribbons that designate which year they belong to; first year students like Shiori have green ribbons, second year students like Nayuki have red ribbons, and third year students like Mai have blue ribbons.
The school was built ten years prior to the events of Kanon. The school had been built over a large wheat field where Yuichi and Mai had played in as children.