Sooo. Why are all the “don’t throw trash” signs in Ogaki in Spanish?

I spent 2 months in Japan travelling through central and north Honshu but I only encountered this in Ogaki. The signs are everywhere.

Is there a large Spanish speaking population in the Ogaki/gifu city area? Or is it just one family of Spanish speakers that have pissed off the entire city by not picking up their dog poop so now they have set up signs everywhere? 😂

Found it a bit funny since it is usually in english 😅