Yeah, the lines the fake spirits said are important, I hope Chino goes back to that eventually now that Cocoa told her why they said that.
Also if Chino figured out it was all real thanks to grandpa coming back (and the twins talking about her mom) then she could realize Cocoa really went into the future.
Those spirits gathered in a dark blob in page 5 though, they remind me of the ones in Urara Meirochou, I wonder if it's an intentional reference? Not the first time they would reference another kirara manga.
Good to see Chiya brought back her chainsaw.