I'm not sure about The Shapeshifter's resurrection. I know people think she's the baby that Ayane lost, but The Shapeshifter implied her and Ayane's relationship would be a future one:
Not to mention, The Shapeshifter shows up way before Ayane loses the baby. In the First Happy Event, and the Chapter 1 'Scientific Research' Main Event as a secret scene.
Ayane's Unnamed Baby that she lost might just be The Unnamed Baby:
And possibly The Shapeshifter's sibling.
On the other hand, Yasu's god has apparently brought someone back:
Whether that's Yasu or someone else, I'm not sure.
Ironically, HOPE might be the answer after all.