9.5/10
This is basically Payoff: The Movie. Just like Avengers: Endgame but with less cringe & no plot-convenient rat.
Everything else has been said, but I'm glad that I get to finally see...
My only disappointment is that we don't get to see Sigma & Hyper World and how they work considering this might be the last anime that we'll get from the Gridman universe (no pun intended).
Otherwise, this is a fantastic cap off to the Gridman saga.