Well. I wouldn't want to bring up Air's true ending here. It's not something you'd want to see in Kanon (unless you're npal.
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Besides a "no girl" win ending is going against Kanon's game mechanics, Kanon's principle of miracles and who is the real lover in this story (i.e, who's path is the major path in this series). This title is just merging all the game paths.