Aye.. unless we're going to go hyper-surreal, I'd say there was an Ayu projection into real-life. I've always assumed it was comatose Ayu projecting but I can't rule out a Yuuichi generated Ayu. It just seems more poetic to me that Ayu be the source since her injury occurred on "kitsune hill" - source of much magic. Layers of delusion trip over into levels of existentialism that make the Matrix simple (yes, it was simple but many people don't really *think* about existence so it was overload for those).
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