I had pretty much figured something like this was where Buran came from, at the end of "The Human Experience," but I didn't expect we would get the confirmation from Fubuki-in-Valhalla's perspective. Interesting choice.

If I have the timeline right, "eighteen years since I woke up" means she's only been a shipgirl since two years after the Ragnarok. I'm looking forward to seeing those pieces come together.