Gokukoku no Brynhildr - Vol. 13 Ch. 130 - The First Time...

[MangaDex]

 

[depzdai]

I want to make that pa pa pa pa pa pa pa pa pa pa pa pa pa pa pa pa pa pa pa pa pa sound too.

 

[carnage_panda]

I'm not sure what the difference between both plates are. Seems like they're both probably filled with industrial waste.