If you loved This Boy Caught a Merman, 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
Theyboth carry the tender mood tag, and they sit in Animation / Fantasy / Romance territory. If that's the register that drew you to This Boy Caught a Merman, the second film will land in a comparable space — through a different lens.
tender
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.

