I have no idea how much of Ammy's story has actually occurred in Japan, and how much has occurred in some alternate plane on Japan! Orochi is kind of a big deal (she understated), and I don't want to mess around with other peoples' Japan-based histories.

I think a clever plan of having Orochi still be sealed, even though Ammy is looking for Susanoo, should fix a lot of that? Though I think there's still a part of this whole mess where she seals him on Earth that should be a couple hundred years back. Probably kind of messy.