It's the first time I've seen one myself, but...

They're weapons used in wars between nations in the Outside World.

Already long obsolete, though.

An Outside World weapon... you say.

That sounds like something the kappa would love to see.

Indeed. Even if beat up, it's a piece of engineering unknown in Gensokyo.

I bet that's exactly why Iizunamaru-dono wanted us to dispose of it.

As I said. This is a weapon.

This is a "fighter aircraft".

They would leap at the opportunity.