It's highly possible.
After all,
Spoiler for speculation based on prologue:
They did it in Kuzu, just before the invasion
They might have adopted Chigusa as their family name for certain reason. I'm more curious as to how the cross road junction fits into everything.
Edit:
Then again, it did say original animation, so the anime might be standalone in some ways as part of the cross-media project. But it's no doubt centered on characters in v2 and v3.