 If you liked
Kanon (2006)
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 ...then you might like
Grisaia no Kajitsu
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These two series, both based on VNs, feature similar structures in their attempts to uncover as much of as many of the routes as possible in a very short timeframe (We're talking about a 20 hour VN compared against an 8 hour show, after all).
Grisaia has far more "ecchi" elements to it, and much fewer supernatural elements than Kanon, but the viewer who enjoys one would likely enjoy the other.