Crossovers that MUST be

[Jorlem]

At the start of the third episode of Nanoha, we see Nanoha and Yuuno sealing a Jewel Seed in front of what appears to be a high school.  What if this is the high school attended by one Makoto Mizuhara, on the fateful night when Ifurita sent everyone still on school grounds to El-Hazard?  Fate and Precia would follow a few weeks later, as without Nanoha's interference, or her battles with Fate attracting the attention of the TSAB, Fate would have been able to collect all but five of the Jewel Seeds with little difficulty. Having surpassed the 13 Seeds needed as a minimum, Precia's spell would be cast successfully, though El-Hazard doesn't quite live up to the legends she had hoped for.
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Stand between the Silver Crystal and the Golden Sea.
"Youngsters these days just have no appreciation for the magnificence of the legendary cucumber."  --Krityan Elder, Tales of Vesperia.