In other words, Roxy's panties are out of the question.
No, wait.
Nanahoshi successfully summoned a PET bottle.
So it isn't impossible.
It's more like this is the limit of the current technology of this world.
Then Perugius met Nanahoshi and confirmed her results.
So that's why Perugius and Nanahoshi ended up working together.
"May I continue?"
"Ah, yes. Sorry for the interruption."
"No, questions show you're paying attention.