If you loved Koro-sensei Q!, try Fate/Prototype
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
What they share
Both films are directed by Seiji Kishi, and they sit in Animation territory. If that's the register that drew you to Koro-sensei Q!, the second film will land in a comparable space — through a different lens.
What Fate/Prototype is
An origin point, remade. A magus and his servant Saber enter the familiar life-or-death battle for the Holy Grail. It seems the more things change, the more they stay the same.

