Without any spoilers, I think there's a loose link between the two. Not story wise but thematically. EDT2 has the sub title ''Hideki''. Hideki is also a name you'll hear in the first EDT. They are not the same Hideki, but I think they have some similarities, IIRC. I don't want to go too much into it though, since I need to rewatch it, haven't seen it in years, and also, I don't want to go in spoilers territory.
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